Allow the lint job to continue even if a step errors

This is toggled by the same value that toggles a tmate session so that
debugging can be done even if a step fails. We also move the logic
around the remote-shell argument for workflow_dispatch to the
environment value setting.

.github/workflows/build.yml

@@ -33,14 +33,15 @@ env:
  # #65.
  PLATFORMS: "linux/amd64"
  PRE_COMMIT_CACHE_DIR: ~/.cache/pre-commit
- RUN_TMATE: ${{ secrets.RUN_TMATE }}
+ RUN_TMATE: ${{ github.event.inputs.remote-shell == 'true' || secrets.RUN_TMATE }}
 
 jobs:
  lint:
  # Checks out the source and runs pre-commit hooks. Detects coding errors
  # and style deviations.
  name: "Lint sources"
  runs-on: ubuntu-latest
+ continue-on-error: ${{ github.event.inputs.remote-shell == 'true' || false }}
  steps:
  - id: setup-env
  uses: cisagov/setup-env-github-action@develop
@@ -225,7 +226,7 @@ jobs:
  echo tags=${TAGS}
  - name: Setup tmate debug session
  uses: mxschmitt/action-tmate@v3
- if: github.event.inputs.remote-shell == 'true' || env.RUN_TMATE
+ if: env.RUN_TMATE
  build:
  # Builds a single test image for the native platform. This image is saved
  # as an artifact and loaded by the test job.