workflows: build: Install git before checkout

If git is not available, the checkout action checks out code using the
REST API, which only includes the source. Building the Python module
depends on having git version information.

.github/workflows/build.yml

@@ -43,11 +43,27 @@ jobs:
       fail-fast: false
       matrix:
           os: [ "alpine", "archlinux", "fedora", "ubuntu" ]
+          include:
+            - install_git_cmd: apk add git
+              os: alpine
+            - install_git_cmd: pacman -Sy --noconfirm git
+              os: archlinux
+            - install_git_cmd: dnf --assumeyes install git
+              os: fedora
+            - install_git_cmd: |
+                export DEBIAN_FRONTEND=noninteractive
+                apt-get update
+                apt-get --assume-yes install git
+              os: ubuntu
 
     container:
       image: ${{ matrix.os }}
 
     steps:
+      # https://github.com/actions/checkout/issues/335
+      - name: Install git
+        run: ${{ matrix.install_git_cmd }}
+
       - name: Check out source
         uses: actions/checkout@v3