Publish Docker images on ghcr.io (#222)

.github/workflows/docker-publish-stable.yml

+name: Publish Docker images for release versions
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-publish-image:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Get tag name
+        uses: olegtarasov/get-tag@v2.1
+        id: tagName
+
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log in to ghcr.io Container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/fkie-cad/cwe_checker:${{ steps.tagName.outputs.tag }}
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.github/workflows/docker-publish.yml

+name: Publish Docker image based on master branch
+
+on:
+  push:
+    branches: ['master']
+
+jobs:
+  build-and-publish-image:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Log in to ghcr.io Container registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ghcr.io/fkie-cad/cwe_checker:latest
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