ci: Add alpm backend to CI (debian)

For building and installing purposes, build dependencies of
pacman-package-manager (which includes 'libalpm' package) provided by
debian are sufficient. So, we now build and test 'alpm' backend job
directly in debian ci after 'apt' backend job completes.

Part of: PackageKit#691

.github/workflows/build-test.yml

@@ -34,3 +34,8 @@ jobs:
         run: podman run -t -v `pwd`:/build packagekit-${{ matrix.distro }}
              ./tests/ci/build-and-test.sh -Dpackaging_backend=zypp
         if: ${{ matrix.distro == 'debian' }}
+
+      - name: Build & Test [ALPM]
+        run: podman run -t -v `pwd`:/build packagekit-${{ matrix.distro }}
+             ./tests/ci/build-and-test.sh -Dpackaging_backend=alpm
+        if: ${{ matrix.distro == 'debian' }}

tests/ci/Dockerfile-debian

@@ -16,6 +16,10 @@ RUN apt-get install -yq meson appstream
 # install dependencies for 'zypp' backend
 RUN apt-get install -yq libzypp-dev
 
+# install dependencies for 'alpm' backend
+RUN apt-get install -yq libalpm-dev
+RUN apt-get build-dep -yq pacman-package-manager
+
 # finish
 RUN mkdir /build
 WORKDIR /build