Remove maven-settings.xml.gpg

This removes the encrypted file from the repository and uses the recommended approach in GitHub

See https://docs.github.com/en/actions/publishing-packages/publishing-java-packages-with-maven#publishing-packages-to-the-maven-central-repository

.github/workflows/release.yml

@@ -29,17 +29,14 @@ jobs:
           gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
           passphrase: ${{ secrets.GPG_PASSPHRASE }}
 
-      - uses: actions/setup-java@v1.4.3
+      - uses: actions/setup-java@v2
         with:
+          distribution: 'temurin'
           java-version: 11
-
-      - name: Cache local Maven repository
-        uses: actions/cache@v2
-        with:
-          path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
+          cache: 'maven'
+          server-id: ossrh
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
 
       - name: Configure Git author
         run: |
@@ -48,12 +45,14 @@ jobs:
 
       - name: Maven release ${{steps.metadata.outputs.current-version}}
         run: |
-          gpg --quiet --batch --yes --decrypt --passphrase="${{secrets.GPG_PASSPHRASE}}" --output maven-settings.xml .github/release/maven-settings.xml.gpg
           git checkout -b release
-          mvn -B release:prepare -Prelease -DreleaseVersion=${{steps.metadata.outputs.current-version}} -DdevelopmentVersion=${{steps.metadata.outputs.next-version}} -s maven-settings.xml
+          mvn -B release:prepare -Prelease -DreleaseVersion=${{steps.metadata.outputs.current-version}} -DdevelopmentVersion=${{steps.metadata.outputs.next-version}}
           git checkout ${{github.base_ref}}
           git rebase release
-          mvn -B release:perform -Darguments=-DperformRelease -DperformRelease -Prelease -s maven-settings.xml
+          mvn -B release:perform -Darguments=-DperformRelease -DperformRelease -Prelease
+        env:
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
 
       - name: Push changes to ${{github.base_ref}}
         uses: ad-m/[email protected]