Update ubuntu pipeline to extract latest tag

.github/workflows/ubuntu.yml

@@ -17,8 +17,35 @@ on:
       - released
 
 jobs:
+  get-tag:
+    # Pre-job to fetch the latest tag
+    runs-on: ubuntu-latest
+    outputs:
+      major: ${{ steps.extract_tag.outputs.major }}
+      minor: ${{ steps.extract_tag.outputs.minor }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Ensure all history and tags are fetched
+
+      - name: Get latest tag
+        id: extract_tag
+        run: |
+          latest_tag=$(git describe --tags `git rev-list --tags --max-count=1`)
+          echo "Latest tag: $latest_tag"
+
+          # Extract major and minor version from the tag
+          IFS='.' read -r major minor patch <<< "$latest_tag"
+          echo "Major: $major"
+          echo "Minor: $minor"
+
+          # Set as output variables
+          echo "::set-output name=major::$major"
+          echo "::set-output name=minor::$minor"
   ci:
     name: ${{ matrix.distro }}
+    needs: get-tag  # Make sure the 'ci' job waits for the 'get-tag' job to finish
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -37,7 +64,7 @@ jobs:
             distro: rolling
             vcs-file: .github/workflows/dependencies.repos
     container:
-      image: ghcr.io/tesseract-robotics/tesseract_qt:${{ matrix.os }}-${{ vars.TESSERACT_DOCKER_TAG }}
+      image: ghcr.io/tesseract-robotics/tesseract_qt:${{ matrix.os }}-${{ needs.get-tag.outputs.major }}.${{ needs.get-tag.outputs.minor }}
       env:
         CCACHE_DIR: ${{ github.workspace }}/${{ matrix.distro }}/.ccache
         DEBIAN_FRONTEND: noninteractive