workflows/tests.yml: add gentoo to CI

Signed-off-by: Andrew Ammerlaan <[email protected]>

.github/workflows/tests.yml

@@ -31,9 +31,11 @@ jobs:
           - {name: "ubuntu", tag: "22.04"}
           - {name: "ubuntu", tag: "20.04"}
           - {name: "ubuntu", tag: "18.04"}
+          - {name: "gentoo/stage3", tag: "latest"}
     runs-on: ubuntu-20.04
+
     container:
-      image: docker://docker.io/library/${{ matrix.distro.name }}:${{ matrix.distro.tag }}
+      image: docker://docker.io/${{ matrix.distro.name }}:${{ matrix.distro.tag }}
 
     steps:
     - uses: actions/checkout@v3
@@ -70,6 +72,12 @@ jobs:
         apt-get update -q
         apt-get install -qy gcc make linux-headers-generic linux-image-generic openssl shim-signed
 
+    - name: Install Gentoo Linux dependencies
+      if: matrix.distro.name == 'gentoo/stage3'
+      run: |
+        emerge --sync
+        emerge --noreplace -j2 -l2 gentoo-kernel-bin openssl
+
     - name: Compute packaged kernel version
       id: versions
       run: |
@@ -84,6 +92,8 @@ jobs:
             KERNEL_VER="$(LANG=C dpkg --status linux-headers-amd64 | sed -n 's/^Depends: linux-headers-\(\S\+\)\( .*\)\?/\1/p' | head -n 1)"
         elif [ "${{ matrix.distro.name }}" = ubuntu ] ; then
             KERNEL_VER="$(LANG=C dpkg --status linux-headers-generic | sed -n 's/^Depends: linux-headers-\(\S\+\)\( .*\)\?/\1/p' | head -n 1)"
+        elif [ "${{ matrix.distro.name }}" = gentoo ] ; then
+            KERNEL_VER="$(emerge --search gentoo-kernel-bin | sed -n 's/Latest version installed: \([0-9.]\)/\1/p' | head -n 1)"
         fi
         if [ -z "${KERNEL_VER}" ] ; then
             echo >&2 "Error: no kernel package found"