Clean up some things in the GitHub build

  1. Use the "stable" identifier in the Go setup action.

  2. Use a Go 1.24 Dockerfile. I added GOTOOLCHAIN=auto right after 1.24
     was released and there was no official image, but now we can switch
     over and shorten the build a little.

  3. Use the latest Dockerfile frontend.

Author: ahamlinman

.github/workflows/mainline.yml

@@ -13,7 +13,7 @@ jobs:
       uses: actions/checkout@v4
     - name: Install Go
       uses: actions/setup-go@v5
-      with: { go-version: "1.24" }
+      with: { go-version: stable }
     - name: Run Tests
       run: go test -v -race ./...
     - name: Set up Docker Buildx

Dockerfile

@@ -1,7 +1,7 @@
-# syntax = docker.io/docker/dockerfile:1.13
+# syntax = docker.io/docker/dockerfile:1.14
 
 ARG ALPINE_BASE=docker.io/library/alpine:3.21
-ARG GOLANG_BASE=docker.io/library/golang:1.23-alpine3.21
+ARG GOLANG_BASE=docker.io/library/golang:1.24-alpine3.21
 
 
 FROM --platform=$BUILDPLATFORM $GOLANG_BASE AS build