ci: Extract CoreOS install test to separate job

The CoreOS install test was previously run conditionally within the
test-integration matrix job. Running it separately avoids disk space
issues that can occur when both tests run in the same job, as the
CoreOS test requires building additional container images.

Assisted-by: OpenCode (Opus 4.5)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

.github/workflows/ci.yml

@@ -206,33 +206,65 @@ jobs:
           fi
           just clean-local-images
 
-      - name: Run TMT test about bootc install on coreos
+      - name: Archive TMT logs
+        if: always()
+        uses: actions/upload-artifact@v6
+        with:
+          name: tmt-log-PR-${{ github.event.number }}-${{ matrix.test_os }}-${{ matrix.variant }}-${{ env.ARCH }}
+          path: /var/tmp/tmt
+
+  # Test bootc install on Fedora CoreOS (separate job to avoid disk space issues
+  # when run in the same job as test-integration).
+  # Uses fedora-43 as it's the current stable Fedora release matching CoreOS.
+  test-coreos:
+    needs: package
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v6
+      - name: Bootc Ubuntu Setup
+        uses: ./.github/actions/bootc-ubuntu-setup
+        with:
+          libvirt: true
+      - name: Install tmt
+        run: pip install --user "tmt[provision-virtual]"
+
+      - name: Setup env
         run: |
-          # Only test fedora-43 on fedora-coreos:testing-devel
-          if [ "${{ matrix.test_os }}" = "fedora-43" ] && [ "${{ matrix.variant }}" = "ostree" ]; then
-            just build-testimage-coreos target/packages
-            just test-tmt-on-coreos plan-bootc-install-on-coreos
-            just clean-local-images
-          else
-            echo "skipped"
-          fi
+          BASE=$(just pullspec-for-os base fedora-43)
+          echo "BOOTC_base=${BASE}" >> $GITHUB_ENV
+          echo "BOOTC_variant=ostree" >> $GITHUB_ENV
+
+      - name: Download package artifacts
+        uses: actions/download-artifact@v7
+        with:
+          name: packages-fedora-43
+          path: target/packages/
+
+      - name: Build container and test on CoreOS
+        run: |
+          BOOTC_SKIP_PACKAGE=1 just build
+          just build-testimage-coreos target/packages
+          just test-tmt-on-coreos plan-bootc-install-on-coreos
+          just clean-local-images
 
       - name: Archive TMT logs
         if: always()
         uses: actions/upload-artifact@v6
         with:
-          name: tmt-log-PR-${{ github.event.number }}-${{ matrix.test_os }}-${{ matrix.variant }}-${{ env.ARCH }}
+          name: tmt-log-PR-${{ github.event.number }}-fedora-43-coreos-${{ env.ARCH }}
           path: /var/tmp/tmt
 
   # Sentinel job for required checks - configure this job name in repository settings
   required-checks:
     if: always()
-    needs: [cargo-deny, validate, package, test-integration]
+    needs: [cargo-deny, validate, package, test-integration, test-coreos]
     runs-on: ubuntu-latest
     steps:
       - run: exit 1
         if: >-
           needs.cargo-deny.result != 'success' ||
           needs.validate.result != 'success' ||
           needs.package.result != 'success' ||
-          needs.test-integration.result != 'success'
+          needs.test-integration.result != 'success' ||
+          needs.test-coreos.result != 'success'