[New] Add GH script to publish docker image

.github/CODEOWNERS

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+* @opendata-mvcr/c5-backend-reviewers

.github/workflows/build-docker.yml

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+name: Build docker
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: al-ofn-vocabulary-tools-server
+  USERNAME: ${{ github.actor }}
+  TOKEN: ${{ secrets.GITHUB_TOKEN }}
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --file Dockerfile --tag $IMAGE_NAME
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push image
+        run: |
+          IMAGE_TAG=${{ env.REGISTRY }}/${{ github.repository }}/${{ env.IMAGE_NAME }}:latest
+          echo IMAGE_TAG=$IMAGE_TAG
+          docker tag $IMAGE_NAME $IMAGE_TAG
+          docker push $IMAGE_TAG
+
+  
+  update-dev-instance:
+    needs: build-and-push-image
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Call update webhook
+        uses: wei/[email protected]
+        with:
+          args: |
+            -H \"X-Secret: ${{ secrets.AL_DEV_SECRET }}\" -X POST https://xn--slovnk-test-scb.mvcr.gov.cz/modelujeme/update/${{ env.IMAGE_NAME }}.php