Prevent issues with Docker Hub rate limits in CI (#124)

Switches to the new GitHub Actions runner groups to:
1. Avoid the rate limit issues mentioned in:
   heroku/buildpacks-go#283
2. To update to Ubuntu 24.04

Also pre-pulls the builder and run images to prevent duplicate
pulls and impact on rate limits, as mentioned in:
heroku/buildpacks-python#223

See also:
https://salesforce.quip.com/bu6UA0KImOxJ#temp:C:GZR57becb9df8d94f80b132168fd
https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md

GUS-W-16238120.

.github/workflows/check_changelog.yml

@@ -9,7 +9,7 @@ permissions:
 
 jobs:
  check-changelog:
- runs-on: ubuntu-latest
+ runs-on: ubuntu-24.04
  if: (!contains(github.event.pull_request.labels.*.name, 'skip changelog'))
  steps:
  - name: Checkout

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ env:
 
 jobs:
  lint:
- runs-on: ubuntu-latest
+ runs-on: ubuntu-24.04
  steps:
  - name: Checkout
  uses: actions/checkout@v4
@@ -29,7 +29,7 @@ jobs:
  run: cargo fmt -- --check
 
  unit-test:
- runs-on: ubuntu-latest
+ runs-on: ubuntu-24.04
  steps:
  - name: Checkout
  uses: actions/checkout@v4
@@ -51,7 +51,7 @@ jobs:
  arch: "arm64"
  - builder: "builder:20"
  arch: "arm64"
- runs-on: ${{ matrix.arch == 'arm64' && 'pub-hk-ubuntu-22.04-arm-medium' || 'ubuntu-latest' }}
+ runs-on: ${{ matrix.arch == 'arm64' && 'pub-hk-ubuntu-24.04-arm-medium' || 'ubuntu-24.04' }}
  env:
  INTEGRATION_TEST_CNB_BUILDER: heroku/${{ matrix.builder }}
  steps:
@@ -69,8 +69,18 @@ jobs:
  uses: Swatinem/rust-cache@v2.7.3
  - name: Install Pack CLI
  uses: buildpacks/github-actions/setup-pack@v5.7.2
+ # The images are pulled up front to prevent duplicate pulls due to the tests being run concurrently.
  - name: Pull builder image
  run: docker pull ${{ env.INTEGRATION_TEST_CNB_BUILDER }}
+ - name: Pull run image
+ # Using `docker inspect` rather than `pack builder inspect` since the latter makes
+ # additional requests to Docker Hub even when the image is available locally.
+ run: |
+ RUN_IMAGE=$(
+ docker inspect --format='{{index .Config.Labels "io.buildpacks.builder.metadata"}}' '${{ env.INTEGRATION_TEST_CNB_BUILDER }}' \
+ | jq --exit-status --raw-output '.stack.runImage.image'
+ )
+ docker pull "${RUN_IMAGE}"
  # The integration tests are annotated with the `ignore` attribute, allowing us to run
  # only those and not the unit tests, via the `--ignored` option. On the latest stack
  # we run all integration tests, but on older stacks we only run stack-specific tests.