Deploy snapshot on Apache Nexus (#893)

Author: bchapuis

.github/workflows/deploy-snapshot.yml

@@ -0,0 +1,43 @@
+name: Deploy snapshot
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy-snapshot:
+    name: Deploy snapshot
+    runs-on: ubuntu-latest
+    if: "!startsWith(github.ref, 'refs/tags/v')"
+    steps:
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Java 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: temurin
+          cache: maven
+          server-id: apache.snapshots.https
+          server-username: NEXUS_USER
+          server-password: NEXUS_PW
+          gpg-private-key: ${{ secrets.BAREMAPS_GPG_SECRET_KEY }}
+
+      - name: Set up GPG
+        shell: bash
+        run: |
+          echo "${{ secrets.BAREMAPS_GPG_SECRET_KEY }}" | gpg --batch --import
+          gpg --list-keys
+        env:
+          GPG_KEY_ID: ${{ secrets.GPG_KEY_ID }}
+
+      - name: Publish snapshots on Apache Nexus
+        shell: bash
+        env:
+          NEXUS_USER: ${{ secrets.NEXUS_USER }}
+          NEXUS_PW: ${{ secrets.NEXUS_PW }}
+        run: |
+          ./mvnw deploy -DskipTests -Dmaven.javadoc.skip=true -B -V