Bump Go in Docker and support latest github.com hosts

docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.17-alpine as builder
+FROM golang:1.21-alpine as builder
 ARG VERSION=0.0.0-docker
 WORKDIR /app
 RUN apk --no-cache add ca-certificates git
@@ -15,7 +15,7 @@ COPY . .
 
 RUN CGO_ENABLED=0 go build -ldflags="-w -s -X 'github.com/riser-platform/riser-server/pkg/util.VersionString=${VERSION}'" -o /go/bin/riser-server
 
-FROM alpine:3.13
+FROM alpine:3.18
 RUN apk --no-cache add ca-certificates git openssh-client
 # Add git hosts to known hosts file so we can use
 # StrickHostKeyChecking with git+ssh

docker/known_hosts.sh

@@ -10,8 +10,7 @@ set -eu
 
 known_hosts_file=${1}
 known_hosts_file=${known_hosts_file:-/etc/ssh/ssh_known_hosts}
-hosts="github.com gitlab.com bitbucket.org ssh.dev.azure.com vs-ssh.visualstudio.com"
-hosts_2022="source.developers.google.com"
+hosts="github.com"
 
 # The heredoc below was generated by constructing a known_hosts using
 #
@@ -40,21 +39,15 @@ export LC_ALL=C
 
 generate() {
     ssh-keyscan ${hosts} > ${known_hosts_file}
-    ssh-keyscan -p 2022 ${hosts_2022} >> ${known_hosts_file}
 }
 
 validate() {
 ssh-keygen -l -f ${known_hosts_file} | sort > "$fingerprints"
 
 diff - "$fingerprints" <<EOF
-2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
-2048 SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8 github.com (RSA)
-2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
-2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
-2048 SHA256:zzXQOXSRBEiUtuE8AikJYKwbHaxvSc0ojez9YXaGp1A bitbucket.org (RSA)
-256 SHA256:AGvEpqYNMqsRNIviwyk4J4HM0lEylomDBKOWZsBn434 [source.developers.google.com]:2022 (ECDSA)
-256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
-256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
+256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
+256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
+3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
 EOF
 
 }