.github: use workflow calls to build and test

Redesign how GH actions are triggered. This new design uses a
self-trigger to start jobs which are only started via workflow_calls.

The main benefit of this is to be able to start workflows from various
Infix Spins without needing to duplicate the workflow files in them.

Upcoming patches are intended to parameterize to allow Spins to pass
different architectures, brand names and such.

Signed-off-by: Richard Alpe <richard@bit42.se>

.github/workflows/test.yml

@@ -0,0 +1,78 @@
+name: Test Infix
+
+on:
+  workflow_dispatch:
+  workflow_call:
+    inputs:
+      target:
+        required: true
+        type: string
+
+jobs:
+  test:
+    name: Regression Test of Infix x86_64
+    runs-on: [ self-hosted, regression ]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          clean: true
+          submodules: recursive
+
+      - name: Set Build Variables
+        id: vars
+        run: |
+          if [ -n "${{ needs.build.outputs.build_id }}" ]; then
+              echo "INFIX_BUILD_ID=${{ needs.build.outputs.build_id }}" \
+                   >>$GITHUB_ENV
+          fi
+
+          if [ "$GITHUB_REF_NAME" != "main" ]; then
+              flavor="_minimal"
+          else
+              flavor=""
+          fi
+          echo "flv=$flavor"              >> $GITHUB_OUTPUT
+
+      - name: Configure x86_64${{ steps.vars.outputs.flv }}
+        run: |
+          make x86_64${{ steps.vars.outputs.flv }}_defconfig
+
+      - uses: actions/download-artifact@v4
+        with:
+          pattern: "artifact-*"
+          merge-multiple: true
+
+      - name: Restore x86-64${{ steps.vars.outputs.flv }} output/
+        run: |
+          ls -l
+          mkdir -p output
+          mv infix-x86_64.tar.gz output/
+          cd output/
+          tar xf infix-x86_64.tar.gz
+          ln -s infix-x86_64 images
+
+      - name: Regression Test x86_64${{ steps.vars.outputs.flv }}
+        run: |
+          make test
+
+      - name: Publish Test Result for x86_64${{ steps.vars.outputs.flv }}
+        # Ensure this runs even if Regression Test fails
+        if: always()
+        run: cat test/.log/last/result-gh.md >> $GITHUB_STEP_SUMMARY
+
+      - name: Generate Test Report for x86_64${{ steps.vars.outputs.flv }}
+        # Ensure this runs even if Regression Test fails
+        if: always()
+        run: |
+          asciidoctor-pdf \
+          --theme test/9pm/report/theme.yml \
+          -a pdf-fontsdir=test/9pm/report/fonts \
+          test/.log/last/report.adoc \
+          -o test/.log/last/report.pdf
+
+      - name: Upload Test Report as Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-report
+          path: test/.log/last/report.pdf
+