[CI] Update PR GHA to skip signing always

Updates the GHA PR workflow (ci-pr.yml) to skip signing always. This
allows sanity checking pre-release version number updates w/o attempting
to sign the bits as that fails due to no secrets available to PRs.

Signed-off-by: onobc <chris.bono@gmail.com>

Author: onobc

.github/workflows/ci-pr.yml

@@ -30,7 +30,7 @@ jobs:
           cache: maven
       - name: Build, test, and run samples (Java ${{ matrix.javaVersion }} ${{ matrix.distribution }})
         run: |
-          ./mvnw -B clean install
+          ./mvnw -B clean install-Dgpg.skip=true
       - name: Upload Build Reports (Java ${{ matrix.javaVersion }} ${{ matrix.distribution }})
         if: failure()
         uses: actions/upload-artifact@v4