add github-publish-workflow

Author: infeo

.github/workflows/publish-github.yml

@@ -0,0 +1,40 @@
+name: Publish to GitHub Packages
+on:
+  release:
+    types: [published]
+jobs:
+  publish:
+    runs-on: windows-latest
+    if: startsWith(github.ref, 'refs/tags/') # only allow publishing tagged versions
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 11
+          gpg-private-key: ${{ secrets.RELEASES_GPG_PRIVATE_KEY }} # Value of the GPG private key to import
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE # env variable for GPG private key passphrase
+      - uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Enforce project version ${{ github.event.release.tag_name }}
+        run: mvn versions:set -B -DnewVersion=${{ github.event.release.tag_name }}
+      - name: Deploy
+        run: mvn deploy -B -DskipTests -Psign,deploy-github --no-transfer-progress
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.RELEASES_GPG_PASSPHRASE }}
+      - name: Slack Notification
+        uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK_URL }}
+          SLACK_USERNAME: 'Cryptobot'
+          SLACK_ICON:
+          SLACK_ICON_EMOJI: ':bot:'
+          SLACK_CHANNEL: 'cryptomator-desktop'
+          SLACK_TITLE: "Published ${{ github.event.repository.name }} ${{ github.event.release.tag_name }}"
+          SLACK_MESSAGE: "Ready to <https://github.com/${{ github.repository }}/actions?query=workflow%3A%22Publish+to+Maven+Central%22|deploy to Maven Central>."
+          SLACK_FOOTER:
+          MSG_MINIMAL: true