Stop (ever) building from source for 1.21+

> After reviewing the details (and how "ouroboros" it would be to solve this "properly", especially in the face of the long-term implications of https://golang.org/issues/54265), my updated proposal is that we effectively revert 11eef5d for 1.21+ -- as of Go 1.21, the _only_ architecture we actually build from source across _all_ our supported variants/distributions is arm32v5 (Debian's `armel`) because Go's published `arm` binaries are explicitly `v6` (see also 40db26d). > > The only suggestion of actual arm32v5 users I've managed to find is someone on one of the older Raspberry Pi devices (which are technically armv6) wanting to use a Debian-based image -- as of 1.21, the Alpine images are using the exact same upstream-provided pre-compiled binaries, so suggesting that those users switch to Alpine's arm32v6 images instead is extremely reasonable.
docker-library · Dec 19, 2023 · 8188fe4 · 8188fe4
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diff --git a/.github/workflows/munge.sh b/.github/workflows/munge.sh
@@ -10,6 +10,7 @@ jq '
 		.matrix.include[]
 		| select(.name | test(" (.+)") | not) # ignore any existing munged builds
 		| select(.os | startswith("windows-") | not) # ignore Windows (always downloads)
+		| select(any(.meta.entries[].tags[]; contains("golang:1.20"))) # https://github.com/docker-library/golang/pull/500#issuecomment-1863578601
 		| .name += " (force build)"
 		| .runs.build = ([
 			"# update versions.json to force us to build Go instead of downloading it",

diff --git a/1.20/alpine3.18/Dockerfile b/1.20/alpine3.18/Dockerfile
diff --git a/1.20/alpine3.19/Dockerfile b/1.20/alpine3.19/Dockerfile
diff --git a/1.21/alpine3.18/Dockerfile b/1.21/alpine3.18/Dockerfile
diff --git a/1.21/alpine3.19/Dockerfile b/1.21/alpine3.19/Dockerfile
diff --git a/1.21/bookworm/Dockerfile b/1.21/bookworm/Dockerfile
diff --git a/1.21/bullseye/Dockerfile b/1.21/bullseye/Dockerfile
diff --git a/1.22-rc/alpine3.18/Dockerfile b/1.22-rc/alpine3.18/Dockerfile