feat(workflows): add workflow for deploying sshd image

.github/workflows/build-image-sshd_tunnel.yml

@@ -0,0 +1,50 @@
+name: Build Image for SSHD Tunnel
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build_push:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./tunnel_image
+    steps:
+      - name: Check Out Repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate Docker image metadata
+        uses: docker/metadata-action@v5
+        id: img_meta
+        with:
+          flavor: |
+            latest=auto
+            suffix=${{ steps.flavor.outputs.name }}
+          images: ghcr.io/${{ github.repository }}-sshd-tunnel
+          tags: |
+            type=sha,format=short,prefix=commit-
+            type=raw,value=latest
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          context: ./
+          push: true
+          tags: ${{ steps.img_meta.outputs.tags }}
+          labels: ${{ steps.img_meta.outputs.labels }}