ci: automate approval process

.github/workflows/3.approve-snapshot.yml

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+name: 3. Approve Snapshot
+
+on:
+  push:
+    branches:
+      - ci/approve-snapshot
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ldi-orchestrator
+
+jobs:
+  approve-snapshot:
+    #if: github.ref == "refs/heads/main"
+    name: Approve Snapshot and Promote
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Set up JDK 18
+        uses: actions/setup-java@v3
+        with:
+          distribution: zulu
+          java-version: 18
+      - name: Determine version
+        run: |
+          export VERSION=$(mvn help:evaluate -Dexpression="project.version" -q -DforceStdout)
+          echo "version=$VERSION" >> $GITHUB_ENV
+      - name: Define docker variables
+        run: |
+          if [[ "${{ env.version }}" != *"SNAPSHOT"* ]]; then
+            echo "Dealing with a snapshot version"
+            echo "${{ env.version }}"
+          fi
+          else
+            echo "Already released"
+          fi