Refresh GHAWs: expand linting, switch to GHCR

.github/workflows/lint-and-build-code.yml

@@ -20,8 +20,21 @@ jobs:
     name: Lint codebase
     runs-on: ubuntu-latest
     timeout-minutes: 10
+    # Don't flag the whole workflow as failed if "experimental" matrix jobs
+    # fail. This allows the unstable image linting tasks to fail without
+    # marking the oldstable and stable image linting jobs as failed.
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      # Don't stop all workflow jobs if the unstable image linting tasks fail.
+      fail-fast: false
+      matrix:
+        container-image: ["go-ci-oldstable", "go-ci-stable"]
+        experimental: [false]
+        include:
+          - container-image: "go-ci-unstable"
+            experimental: true
     container:
-      image: index.docker.io/atc0005/go-ci:go-ci-lint-only
+      image: "ghcr.io/atc0005/go-ci:${{ matrix.container-image}}"
 
     steps:
       - name: Check out code
@@ -52,7 +65,7 @@ jobs:
         container-image: ["go-ci-oldstable", "go-ci-stable", "go-ci-unstable"]
 
     container:
-      image: "index.docker.io/atc0005/go-ci:${{ matrix.container-image}}"
+      image: "ghcr.io/atc0005/go-ci:${{ matrix.container-image}}"
 
     steps:
       - name: Check out code
@@ -71,7 +84,7 @@ jobs:
         container-image: ["go-ci-oldstable", "go-ci-stable", "go-ci-unstable"]
 
     container:
-      image: "index.docker.io/atc0005/go-ci:${{ matrix.container-image}}"
+      image: "ghcr.io/atc0005/go-ci:${{ matrix.container-image}}"
 
     steps:
       - name: Print go version

.github/workflows/lint-and-build-using-make.yml

@@ -22,7 +22,8 @@ jobs:
     # Default: 360 minutes
     timeout-minutes: 10
     container:
-      image: "index.docker.io/golang:latest"
+      # Use (lightly touched) mirror of current "vanilla" upstream golang image
+      image: "ghcr.io/atc0005/go-ci:go-ci-stable-mirror-build"
 
     steps:
       - name: Print go version
@@ -58,7 +59,8 @@ jobs:
     # Default: 360 minutes
     timeout-minutes: 10
     container:
-      image: "index.docker.io/golang:latest"
+      # Use (lightly touched) mirror of current "vanilla" upstream golang image
+      image: "ghcr.io/atc0005/go-ci:go-ci-stable-mirror-build"
 
     steps:
       - name: Print go version

.github/workflows/lint-and-test-only.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     container:
-      image: index.docker.io/atc0005/go-ci:go-ci-lint-only
+      image: ghcr.io/atc0005/go-ci:go-ci-lint-only
 
     steps:
       - name: Check out code

.github/workflows/lint-docker-files.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     container:
-      image: index.docker.io/hadolint/hadolint:latest-debian
+      image: ghcr.io/hadolint/hadolint:latest-debian
 
     steps:
       - name: Check out code