workflows/reusable.yaml: Remove uses: action-build-package

Don't use ci/action-build-package@master in actions.yml anylonger,
spell its steps out one-by-one in reusable.yaml instead. This makes
the step names appear as log section headers in the UI, which is more
explicit and, hence, nicer.

This pretty much obsoletes the composite actions.yml. It should be
probably removed, and since this changes the point of this repository
from providing an action to providing a workflow, it shoud probably
be renamed from action-build-package to workflow-build-package or
something.

Signed-off-by: Jan Lindemann <jan@janware.com>

.github/workflows/reusable.yaml

@@ -7,6 +7,7 @@ jobs:
   test:
     name: Packaging test - ${{ matrix.distro.name }}
     runs-on: public-ci
+
     strategy:
       fail-fast: false
       matrix:
@@ -18,7 +19,35 @@ jobs:
       image: ${{ matrix.distro.image }}
 
     steps:
-      - name: Run packaging test
-        uses: ci/action-build-package@master
+      - name: Checkout repository
+        uses: ci/action-checkout@main-jw
         with:
-          distro-name: ${{ matrix.distro.name }}
+          path: ${{ github.event.repository.name }}
+          working-directory: ${{ github.event.repository.name }}
+          persist-credentials: false
+
+      - name: Install build prerequisites
+        shell: bash
+        run: |
+          set -euxo pipefail
+          export PROJECTS_DIR_REMOTE_BASE=${{ github.server_url }}
+          owner=janware
+          makefile=$PROJECTS_DIR_REMOTE_BASE/$owner/jw-pkg/raw/branch/master/make/projects-dir-minimal.mk
+          curl --create-dirs -o build-jw-foss/Makefile "$makefile"
+          make -C build-jw-foss pkg-manager-refresh
+          make -C build-jw-foss pkg-install-release-deps
+          OFFLINE=true make -C build-jw-foss pkg-rebuild-reinstall
+
+      - name: Build package
+        shell: bash
+        run: |
+          set -euxo pipefail
+          make -C "${{ github.event.repository.name }}" pkg-manager-refresh
+          make -C "${{ github.event.repository.name }}" pkg-install-testbuild-deps
+          make -C "${{ github.event.repository.name }}" pkg-rebuild
+
+      - name: Install package
+        shell: bash
+        run: |
+          set -euxo pipefail
+          make -C "${{ github.event.repository.name }}" pkg-reinstall