Create docker-image.yml

**added** gh action to build and publish container image

.github/workflows/docker-image.yml

@@ -0,0 +1,26 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  push-store-image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: 'Checkout GitHub Action'
+        uses: actions/checkout@main
+
+      - name: 'Login to GitHub Container Registry'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{github.actor}}
+          password: ${{secrets.GITHUB_TOKEN}}
+
+      - name: 'Build Orbiter Image'
+        run: |
+          docker build -f ./Dockerfile --tag ghcr.io/spaytac/orbiter:latest .
+          docker push ghcr.io/spaytac/orbiter:latest