experimental validation build

Signed-off-by: Josef Holzmayr <[email protected]>

.github/workflows/validation.yml

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+name: build boards
+
+on:
+  workflow_dispatch:
+  workflow_run:
+    workflows: ["build boards"]
+    types: 
+    - completed
+
+env:
+  BUILDDIR: gh-validation
+
+jobs:
+  prepare:
+    runs-on: [self-hosted, linux, x64]
+    steps:
+      - name: Clean up
+        run: rm -fR $BUILDDIR
+      - uses: actions/checkout@v4
+      - name: cache metadata layers
+        run: ./ci/update-repos
+        env:
+          LAYERCACHE: ${{ vars.PERSISTENT_DIR }}/layers
+
+  build:
+    needs: [prepare]
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      fail-fast: false
+      matrix:
+        board: [
+          raspberrypi4,
+          raspberrypi4-64,
+          raspberrypi5,
+        ]
+        experimental: [false]
+        subpath: [.]
+
+    runs-on: [self-hosted, linux, x64]
+    container:
+      # the container image needs to be effectively hardcoded, it seems.
+      image: ghcr.io/theyoctojester/devcontainer-base-yoep:main
+      volumes:
+        - ${{ vars.PERSISTENT_DIR }}/downloads:${{ vars.BUILD_DL_DIR }}
+        - ${{ vars.PERSISTENT_DIR }}/sstate-cache:${{ vars.BUILD_SSTATE_DIR }}
+        - ${{ vars.PERSISTENT_DIR }}/layers:${{ vars.BUILD_LAYERCACHE_DIR }}
+        - ${{ vars.PERSISTENT_DIR }}/assets:${{ vars.BUILD_ASSETS_DIR }}
+      options: --user ${{ vars.KAS_UID }}:${{ vars.KAS_GID }}
+    steps:
+      - name: enter build dir and build
+        env:
+          DL_DIR: ${{ vars.BUILD_DL_DIR}}
+          SSTATE_DIR: ${{ vars.BUILD_SSTATE_DIR}}
+          KAS_REPO_REF_DIR: ${{ vars.BUILD_LAYERCACHE_DIR}}
+        run: >
+          mkdir -p $BUILDDIR/${{ matrix.board }} &&
+          cd $BUILDDIR/${{ matrix.board }} &&
+          kas checkout ../../kas/${{ matrix.subpath }}/${{ matrix.board }}.yml &&
+          if [ -f "${{ vars.BUILD_ASSETS_DIR }}/site.conf" ]; then 
+          cp ${{ vars.BUILD_ASSETS_DIR }}/site.conf build/conf/site.conf;
+          fi &&
+          kas build ../../kas/${{ matrix.subpath }}/${{ matrix.board }}.yml:../../kas/include/validation.yml

kas/include/validation.yml

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+header:
+  version: 14
+
+repos:
+  meta-mender-community:
+    layers:
+      meta-mender-validation:
+
+local_conf_header:
+  validation: |
+    IMAGE_INSTALL:append = " bootloader-validation "