ci: introduce in ci the compilation testing on different os

Changelog-None: introduce in ci the compilation testing on different os

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

.github/workflows/ci_build.yml

@@ -0,0 +1,17 @@
+name: CI Compilation testing
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { OS: alpine }
+    steps:
+      - uses: actions/checkout@v2
+      - name: Integration testing
+        run: |
+          docker build -f contrib/docker/Dockerfile.${{matrix.OS}} -t clightning-${{matrix.OS}} .