[ci] Run combine but skip all steps (#5695)

This makes it show up as passed instead of skipped so the result
aggregator collapses.

.github/workflows/gradle.yml

@@ -187,32 +187,33 @@ jobs:
     name: Combine
     needs: [build-docker, build-host, build-documentation]
     runs-on: ubuntu-22.04
-    if: |
-      github.repository_owner == 'wpilibsuite' &&
-      (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v'))
+    env:
+      main_or_release: github.repository_owner == 'wpilibsuite' &&
+                       (github.ref == 'refs/heads/main' ||
+                        startsWith(github.ref, 'refs/tags/v'))
     steps:
       - uses: actions/checkout@v3
+        if: env.main_or_release == 'true'
         with:
           repository: wpilibsuite/build-tools
       - uses: actions/download-artifact@v3
+        if: env.main_or_release == 'true'
         with:
           path: combiner/products/build/allOutputs
       - name: Flatten Artifacts
+        if: env.main_or_release == 'true'
         run: rsync -a --delete combiner/products/build/allOutputs/*/* combiner/products/build/allOutputs/
       - name: Check version number exists
+        if: env.main_or_release == 'true'
         run: |
           cat combiner/products/build/allOutputs/version.txt
           test -s combiner/products/build/allOutputs/version.txt
       - uses: actions/setup-java@v3
+        if: env.main_or_release == 'true'
         with:
           distribution: 'zulu'
           java-version: 11
-      - name: Combine
-        if: |
-          !startsWith(github.ref, 'refs/tags/v') &&
-          github.ref != 'refs/heads/main'
-        run: cd combiner && ./gradlew publish -Pallwpilib
-      - name: Combine (Master)
+      - name: Combine (Main)
         if: |
           github.repository_owner == 'wpilibsuite' &&
           github.ref == 'refs/heads/main'
@@ -231,6 +232,7 @@ jobs:
           ARTIFACTORY_PUBLISH_USERNAME: ${{ secrets.ARTIFACTORY_USERNAME }}
           ARTIFACTORY_PUBLISH_PASSWORD: ${{ secrets.ARTIFACTORY_PASSWORD }}
       - uses: actions/upload-artifact@v3
+        if: env.main_or_release == 'true'
         with:
           name: Maven
           path: ~/releases