Try if: always() to ensure completion, regardless of whether install performed, re-enabled check for existing binary

.github/workflows/maven-build.yml

@@ -27,7 +27,10 @@ jobs:
         with:
           path: ~/protobuf-2.6.1-bin
           key: ${{ runner.os }}-protobuf
-      - name: Build protobuf binary
+      - name: Check if protobuf compiler binary is present
+        run: ls /home/runner/protobuf-2.6.1-bin/bin/protoc
+      - name: Build protobuf binary if needed
+        if: failure() # previous step failed - protoc file is not present
         run: |
           curl -L -O https://github.com/google/protobuf/releases/download/v2.6.1/protobuf-2.6.1.tar.gz
           tar xf protobuf-2.6.1.tar.gz
@@ -37,15 +40,18 @@ jobs:
           make protoc
           make install
       - name: Configure ~/.m2/toolchains.xml file
+        if: always()
         run: |
           cp toolchains.xml ~/.m2/toolchains.xml
       - name: Build with Maven - test
+        if: always()
         run:
           mvn -B --file pom.xml verify # Ensure all artifacts build successfully before we attempt deploy in order to prevent partial deploys.
         env:
           MAVEN_REPO_USERNAME: build-pipeline
           MAVEN_REPO_PASSWORD: ${{ secrets.MAVEN_REPO_PASSWORD }}
       - name: Build with Maven - deploy
+        if: always()
         run:
           mvn -B --file pom.xml -DskipTests deploy # Now that all builds have completed, we can deploy all the artifacts.
         env: