ci: Add Alpine

Add setup action for Alpine and start building it. Unfortunately the
testsuite is not ready yet and fails to build like this:

	../testsuite/path.c:219:14: error: conflicting types for '__xstat64';
	have 'int(int,  const char *, struct stat64 *)'
	  219 | WRAP_VERSTAT(__x,64);
	      |              ^~~

Add everything needed on the setup action, so when the underlying issue
is fixed, the testsuite can be enabled in CI.

Signed-off-by: Lucas De Marchi <[email protected]>

.github/actions/setup-alpine/action.yml

@@ -0,0 +1,22 @@
+name: 'setup Alpine'
+description: 'Setup an Alpine container for running CI'
+runs:
+  using: 'composite'
+  steps:
+    - name: Install dependencies
+      shell: bash
+      run: |
+        apk update
+        apk add \
+          autoconf \
+          automake \
+          bash \
+          build-base \
+          gtk-doc \
+          libtool \
+          linux-edge-dev \
+          openssl-dev \
+          scdoc \
+          xz-dev \
+          zlib-dev \
+          zstd-dev

.github/workflows/main.yml

@@ -11,7 +11,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        container: ['ubuntu:22.04', 'ubuntu:24.04', 'archlinux:base-devel', 'fedora:latest']
+        include:
+          - container: 'ubuntu:22.04'
+            test: 'yes'
+          - container: 'ubuntu:24.04'
+            test: 'yes'
+          - container: 'archlinux:base-devel'
+            test: 'yes'
+          - container: 'fedora:latest'
+            test: 'yes'
+          - container: 'alpine:latest'
+            test: 'no'
 
     container:
       image: ${{ matrix.container }}
@@ -25,6 +35,8 @@ jobs:
         if: ${{ startsWith(matrix.container, 'archlinux') }}
       - uses: ./.github/actions/setup-fedora
         if: ${{ startsWith(matrix.container, 'fedora') }}
+      - uses: ./.github/actions/setup-alpine
+        if: ${{ startsWith(matrix.container, 'alpine') }}
 
       - name: configure
         run: |
@@ -38,6 +50,7 @@ jobs:
           make -j$(nproc)
 
       - name: test
+        if: ${{ matrix.test == 'yes' }}
         run: |
           cd build
           make KDIR=/usr/lib/modules/*/build -j$(nproc) check
@@ -48,6 +61,7 @@ jobs:
           DESTDIR=$PWD/inst make install
 
       - name: distcheck
+        if: ${{ matrix.test == 'yes' }}
         run: |
           cd build
           make KDIR=/usr/lib/modules/*/build distcheck