Announce releases with the shared announce-release action

Use utPLSQL/.github/actions/announce-release@v1 to post the release
announcement to the org discussions and to utplsql.github.io.

Author: Jacek Gębal

.github/workflows/release.yml

@@ -111,3 +111,12 @@ jobs:
           name: "${{ inputs.release_version }}"
           generate_release_notes: true
           fail_on_unmatched_files: true
+
+      - name: Announce release in org discussions and on utplsql.github.io
+        uses: utPLSQL/.github/actions/announce-release@v1
+        with:
+          project-name: utPLSQL-maven-plugin
+          tag: v${{ inputs.release_version }}
+          discussion-token: ${{ secrets.API_TOKEN_GITHUB }}
+          site-token: ${{ secrets.API_TOKEN_GITHUB }}
+          site-category: utplsql-maven-plugin