ci: uploading release artifacts

Using the GitHub CLI to upload the release artifacts created by GoReleaser,
because the release creation etc if managed by release-please.

Closes #76

## Testing
```sh
gh release create testing --generate-notes
gh release delete testing --cleanup-tag --yes
```

.github/workflows/release-artifacts.yml

@@ -0,0 +1,27 @@
+name: Continuous Delivery (CD)
+
+# https://docs.github.com/en/actions/using-jobs/assigning-permissions-to-jobs
+permissions:
+  contents: write
+
+on:
+  release:
+    types: [published]
+
+env:
+  # Forcing Earthly to use colours, to make reading output easier.
+  FORCE_COLOR: 1
+
+jobs:
+  release-artifacts:
+    name: Release artifacts.
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download Earthly v0.7.17.
+        run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.7.17/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
+      - name: Checkout code.
+        uses: actions/checkout@v3
+      - name: Release artifacts.
+        run: earthly --ci --secret GH_TOKEN +release-artifacts --release "${GITHUB_REF_NAME}"
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }} # This token is provided by GitHub Actions.

.goreleaser.yaml

@@ -1,8 +1,7 @@
 version: 1
 
 builds:
-  - id: starling-bank-technical-challenge
-    main: ./cmd/starling-bank-technical-challenge
+  - main: ./cmd/starling-bank-technical-challenge
     env:
       - CGO_ENABLED=0
     goos:

Earthfile

@@ -192,3 +192,21 @@ unit-test:
     DO +INSTALL_DEPENDENCIES
     DO +COPY_SOURCECODE
     RUN ./ci/unit-test.sh
+
+
+INSTALL_GITHUB_CLI:
+    COMMAND
+    ENV GITHUB_CLI_VERSION=2.30.0
+    RUN wget "https://github.com/cli/cli/releases/download/v${GITHUB_CLI_VERSION}/gh_${GITHUB_CLI_VERSION}_linux_amd64.tar.gz"
+    RUN tar -xzvf "gh_${GITHUB_CLI_VERSION}_linux_amd64.tar.gz"
+    RUN cp "./gh_${GITHUB_CLI_VERSION}_linux_amd64/bin/gh" /bin/gh
+
+
+release-artifacts:
+    FROM +ubuntu-base
+    RUN apt-get install git wget jq -y
+    DO +INSTALL_GITHUB_CLI
+    COPY +compile/dist ./dist
+    DO +COPY_METADATA
+    ARG release
+    RUN --secret GH_TOKEN ./ci/release-artifacts.sh --release "${release}"

ci/release-artifacts.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+
+# ARG_OPTIONAL_SINGLE([release],[],[],[])
+# ARGBASH_GO()
+# needed because of Argbash --> m4_ignore([
+### START OF CODE GENERATED BY Argbash v2.9.0 one line above ###
+# Argbash is a bash code generator used to get arguments parsing right.
+# Argbash is FREE SOFTWARE, see https://argbash.io for more info
+# Generated online by https://argbash.io/generate
+
+die() {
+	local _ret="${2:-1}"
+	test "${_PRINT_HELP:-no}" = yes && print_help >&2
+	echo "$1" >&2
+	exit "${_ret}"
+}
+
+begins_with_short_option() {
+	local first_option all_short_options=''
+	first_option="${1:0:1}"
+	test "$all_short_options" = "${all_short_options/$first_option/}" && return 1 || return 0
+}
+
+# THE DEFAULTS INITIALIZATION - OPTIONALS
+_arg_release=""
+
+print_help() {
+	printf 'Usage: %s [--release <arg>]\n' "$0"
+}
+
+parse_commandline() {
+	while test $# -gt 0; do
+		_key="$1"
+		case "$_key" in
+		--release)
+			test $# -lt 2 && die "Missing value for the optional argument '$_key'." 1
+			_arg_release="$2"
+			shift
+			;;
+		--release=*)
+			_arg_release="${_key##--release=}"
+			;;
+		*)
+			_PRINT_HELP=yes die "FATAL ERROR: Got an unexpected argument '$1'" 1
+			;;
+		esac
+		shift
+	done
+}
+
+parse_commandline "$@"
+
+# OTHER STUFF GENERATED BY Argbash
+
+### END OF CODE GENERATED BY Argbash (sortof) ### ])
+# [ <-- needed because of Argbash
+set -o errexit
+set -o xtrace
+
+for row in $(jq -c '.[]' "dist/artifacts.json"); do
+	name=$(echo "${row}" | jq -r '.name')
+	name_without_extension=$(echo "${row}" | jq -r '.extra.Binary')
+	path=$(echo "${row}" | jq -r '.path')
+	name_with_architecture=$(echo "${path}" | cut -d '/' -f 2)
+	tmp_path="/tmp/${name//$name_without_extension/$name_with_architecture}"
+
+	# Move with new name, upload then delete.
+	# As otherwise asset names clash.
+	mv "${path}" "${tmp_path}"
+	gh release upload "${_arg_release}" "${tmp_path}"
+	rm "${tmp_path}"
+done
+# ] <-- needed because of Argbash