Update main.yml - Change to 'master-alpine'

Author: rswgnu

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: [27.2, 28.2, 29.4, master]
+        version: [27.2, 28.2, 29.4, master-alpine]
     container: silex/emacs:${{ matrix.version }}-ci
 
     steps:
@@ -26,8 +26,6 @@ jobs:
       - name: Compile
         shell: bash
         run: |
-          yes | apt-get update
-          yes | apt-get install man
           make bin 2>&1 | tee MAKE_BIN_OUTPUT
           echo "Number of warnings: $(grep "Warning:" MAKE_BIN_OUTPUT | wc -l)" >> $GITHUB_STEP_SUMMARY
           echo '```' >> $GITHUB_STEP_SUMMARY