GHA: Sign binaries required signature. Invalidate cache for ls ext snapshot.

.github/workflows/eclipse-ls-extensions-build.yml

@@ -124,7 +124,7 @@ jobs:
 
   purge_cache:
     needs: [ eclipse-language-servers-build ]
-    if: ${{ inputs.build_type != 'snapshot' }}
+#    if: ${{ inputs.build_type != 'snapshot' }}
     runs-on: [self-hosted, macOS]
     steps:
       - uses: ./.github/actions/akamai-purge-osx

.github/workflows/gh-hosted-eclipse-distro-build.yml

@@ -266,6 +266,7 @@ jobs:
           do
             ${{ github.workspace }}/.github/scripts/notarize-osx-distro-file.sh $dmg_file $NOTARIZE_PROFILE &
           done
+          FAIL=0
           for job in `jobs -p`
           do
             wait $job || let "FAIL+=1"