ci: try installing docker on alpine

for the publish container integration test

Author: jpnurmi

.github/workflows/build.yml

@@ -213,6 +213,12 @@ jobs:
           name: ${{ github.sha }}
           path: src
 
+      - name: Install Docker on Alpine Linux
+        if: ${{ contains(matrix.container, 'alpine') }}
+        run: |
+          sudo apk install docker
+          sudo service docker start
+
       - name: Integration test
         uses: getsentry/github-workflows/sentry-cli/integration-test/@v2
         with: