github: Skip clang-analyze when reference generation fails.

Compiling the OVS reference is supposed to succeed unless some external
change breaks this compilation.

One example is when DPDK API changes and breaks OVS compilation.
This case is hit in the dpdk-latest branch, but also when bumping DPDK
version in the main branch.

On the other hand, the clang-analyze check goal is to validate OVS
changes, not external changes.

Fixes: d662eee ("ci: Add clang-analyze to GitHub actions.")
Signed-off-by: David Marchand <[email protected]>

.github/workflows/build-and-test.yml

@@ -432,17 +432,22 @@ jobs:
       run:  ./.ci/linux-prepare.sh
 
     - name: build base reference
+      id: base_reference_build
       if: steps.clang_cache.outputs.cache-hit != 'true'
+      continue-on-error: true
       run:  ./.ci/linux-build.sh
 
     - name: save cache
       uses: actions/cache/save@v4
-      if: steps.clang_cache.outputs.cache-hit != 'true'
+      if: steps.clang_cache.outputs.cache-hit != 'true' && \
+          steps.base_reference_build.outcome == 'success'
       with:
         path: base-clang-analyzer-results
         key:  ${{ steps.cache_key.outputs.key }}
 
     - name: build
+      if: steps.clang_cache.outputs.cache-hit == 'true' || \
+          steps.base_reference_build.outcome == 'success'
       run:  ./.ci/linux-build.sh
 
   build-oss-fuzz: