Try new unstable Clippy action, update PR job logic

.github/workflows/main.yml

@@ -12,7 +12,8 @@ jobs:
 
   build:
     name: Google Cloud Build
-    if: github.head_ref || github.base_ref # This is a pull request, and would fail for external PRs.
+     # This is a pull request, and gcloud would fail for external PRs.
+    if: (!github.head_ref) || (!github.base_ref)
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
@@ -78,10 +79,10 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: stable
+          toolchain: nightly
+          components: clippy
           override: true
       - name: Run clippy
-        uses: actions-rs/clippy-check@v1
+        uses: actions-rs/clippy@master # Next gen Clippy Action, unstable
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features
+          args: --all-features --all-targets