chore: add bazel to build

.gitignore

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+bazel-*

BUILD.bazel

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+load("@bazel_gazelle//:def.bzl", "gazelle")
+
+# gazelle:prefix github.com/mgred/tool-versions-generator
+gazelle(name = "gazelle")
+
+alias(
+    name = "tvg",
+    actual = "//cmd/tvg:tvg",
+)

WORKSPACE

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+workspace(
+    name = "tool_versions_generator",
+)
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "io_bazel_rules_go",
+    sha256 = "6b65cb7917b4d1709f9410ffe00ecf3e160edf674b78c54a894471320862184f",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.39.0/rules_go-v0.39.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.39.0/rules_go-v0.39.0.zip",
+    ],
+)
+
+http_archive(
+    name = "bazel_gazelle",
+    sha256 = "727f3e4edd96ea20c29e8c2ca9e8d2af724d8c7778e7923a854b2c80952bc405",
+    urls = [
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.30.0/bazel-gazelle-v0.30.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.30.0/bazel-gazelle-v0.30.0.tar.gz",
+    ],
+)
+
+load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
+load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")
+load("//build:deps.bzl", "go_dependencies")
+
+# gazelle:repository_macro build/deps.bzl%go_dependencies
+go_dependencies()
+
+go_rules_dependencies()
+
+go_register_toolchains(version = "1.19.3")
+
+gazelle_dependencies()

build/BUILD.bazel

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+exports_files(["deps.bzl"])

build/deps.bzl

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+load("@bazel_gazelle//:deps.bzl", "go_repository")
+
+def go_dependencies():
+    go_repository(
+        name = "com_github_bwesterb_go_ristretto",
+        importpath = "github.com/bwesterb/go-ristretto",
+        sum = "h1:1w53tCkGhCQ5djbat3+MH0BAQ5Kfgbt56UZQ/JMzngw=",
+        version = "v1.2.3",
+    )
+    go_repository(
+        name = "com_github_cloudflare_circl",
+        importpath = "github.com/cloudflare/circl",
+        sum = "h1:fE/Qz0QdIGqeWfnwq0RE0R7MI51s0M2E4Ga9kq5AEMs=",
+        version = "v1.3.3",
+    )
+    go_repository(
+        name = "com_github_golang_protobuf",
+        importpath = "github.com/golang/protobuf",
+        sum = "h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=",
+        version = "v1.5.3",
+    )
+    go_repository(
+        name = "com_github_google_go_cmp",
+        importpath = "github.com/google/go-cmp",
+        sum = "h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=",
+        version = "v0.5.9",
+    )
+    go_repository(
+        name = "com_github_google_go_github_v52",
+        importpath = "github.com/google/go-github/v52",
+        sum = "h1:uyGWOY+jMQ8GVGSX8dkSwCzlehU3WfdxQ7GweO/JP7M=",
+        version = "v52.0.0",
+    )
+    go_repository(
+        name = "com_github_google_go_querystring",
+        importpath = "github.com/google/go-querystring",
+        sum = "h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=",
+        version = "v1.1.0",
+    )
+    go_repository(
+        name = "com_github_protonmail_go_crypto",
+        importpath = "github.com/ProtonMail/go-crypto",
+        sum = "h1:ZK3C5DtzV2nVAQTx5S5jQvMeDqWtD1By5mOoyY/xJek=",
+        version = "v0.0.0-20230518184743-7afd39499903",
+    )
+    go_repository(
+        name = "com_github_yuin_goldmark",
+        importpath = "github.com/yuin/goldmark",
+        sum = "h1:fVcFKWvrslecOb/tg+Cc05dkeYx540o0FuFt3nUVDoE=",
+        version = "v1.4.13",
+    )
+    go_repository(
+        name = "com_google_cloud_go_compute_metadata",
+        importpath = "cloud.google.com/go/compute/metadata",
+        sum = "h1:nBbNSZyDpkNlo3DepaaLKVuO7ClyifSAmNloSCZrHnQ=",
+        version = "v0.2.0",
+    )
+    go_repository(
+        name = "org_golang_google_appengine",
+        importpath = "google.golang.org/appengine",
+        sum = "h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=",
+        version = "v1.6.7",
+    )
+    go_repository(
+        name = "org_golang_google_protobuf",
+        importpath = "google.golang.org/protobuf",
+        sum = "h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=",
+        version = "v1.30.0",
+    )
+    go_repository(
+        name = "org_golang_x_crypto",
+        importpath = "golang.org/x/crypto",
+        sum = "h1:LF6fAI+IutBocDJ2OT0Q1g8plpYljMZ4+lty+dsqw3g=",
+        version = "v0.9.0",
+    )
+    go_repository(
+        name = "org_golang_x_mod",
+        importpath = "golang.org/x/mod",
+        sum = "h1:LUYupSeNrTNCGzR/hVBk2NHZO4hXcVaW1k4Qx7rjPx8=",
+        version = "v0.8.0",
+    )
+    go_repository(
+        name = "org_golang_x_net",
+        importpath = "golang.org/x/net",
+        sum = "h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=",
+        version = "v0.10.0",
+    )
+    go_repository(
+        name = "org_golang_x_oauth2",
+        importpath = "golang.org/x/oauth2",
+        sum = "h1:6dkIjl3j3LtZ/O3sTgZTMsLKSftL/B8Zgq4huOIIUu8=",
+        version = "v0.8.0",
+    )
+    go_repository(
+        name = "org_golang_x_sync",
+        importpath = "golang.org/x/sync",
+        sum = "h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=",
+        version = "v0.1.0",
+    )
+    go_repository(
+        name = "org_golang_x_sys",
+        importpath = "golang.org/x/sys",
+        sum = "h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=",
+        version = "v0.8.0",
+    )
+    go_repository(
+        name = "org_golang_x_term",
+        importpath = "golang.org/x/term",
+        sum = "h1:n5xxQn2i3PC0yLAbjTpNT85q/Kgzcr2gIoX9OrJUols=",
+        version = "v0.8.0",
+    )
+    go_repository(
+        name = "org_golang_x_text",
+        importpath = "golang.org/x/text",
+        sum = "h1:2sjJmO8cDvYveuX97RDLsxlyUxLl+GHoLxBiRdHllBE=",
+        version = "v0.9.0",
+    )
+    go_repository(
+        name = "org_golang_x_tools",
+        importpath = "golang.org/x/tools",
+        sum = "h1:BOw41kyTf3PuCW1pVQf8+Cyg8pMlkYB1oo9iJ6D/lKM=",
+        version = "v0.6.0",
+    )
+    go_repository(
+        name = "org_golang_x_xerrors",
+        importpath = "golang.org/x/xerrors",
+        sum = "h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=",
+        version = "v0.0.0-20191204190536-9bdfabe68543",
+    )

cmd/tvg/BUILD.bazel

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+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "tvg_lib",
+    srcs = [
+        "app.go",
+        "flags.go",
+        "main.go",
+        "utils.go",
+    ],
+    importpath = "github.com/mgred/tool-versions-generator/cmd/tvg",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//pkg/github",
+        "//pkg/output",
+    ],
+)
+
+go_binary(
+    name = "tvg",
+    embed = [":tvg_lib"],
+    visibility = ["//visibility:public"],
+)

pkg/github/BUILD.bazel

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+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "github",
+    srcs = [
+        "assets.go",
+        "client.go",
+    ],
+    importpath = "github.com/mgred/tool-versions-generator/pkg/github",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_github_google_go_github_v52//github",
+        "@org_golang_x_oauth2//:oauth2",
+    ],
+)

pkg/output/BUILD.bazel

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+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "output",
+    srcs = [
+        "output.go",
+        "sha.go",
+    ],
+    importpath = "github.com/mgred/tool-versions-generator/pkg/output",
+    visibility = ["//visibility:public"],
+    deps = ["//pkg/github"],
+)