Add release workflow (#13)

This workflow will track the semver tags and build the container image
for audittail.

Signed-off-by: Juan Antonio Osorio <juan.osoriorobles@eu.equinix.com>

.github/workflows/release.yml

@@ -0,0 +1,47 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - v**
+
+env:
+  AUDITTAIL_IMAGE_NAME: ghcr.io/metal-toolbox/audittail
+
+jobs:
+  container:
+    runs-on: ubuntu-latest
+
+    permissions:
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3.0.0
+
+      - name: Login to ghcr.io
+        uses: docker/login-action@v1.14.1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build container images
+        run: |
+          revision="$(git rev-parse "${GITHUB_REF_NAME:-HEAD}")"
+          docker build \
+            -f ./images/audittail/Containerfile \
+            -t "${AUDITTAIL_IMAGE_NAME}:latest" \
+            -t "${AUDITTAIL_IMAGE_NAME}:${GITHUB_REF_NAME}" \
+            -t "${AUDITTAIL_IMAGE_NAME}:${revision}" \
+            --label "org.opencontainers.image.source=https://github.com/metal-toolbox/auditevent" \
+            --label "org.opencontainers.image.created=$(date --iso-8601=seconds)" \
+            --label "org.opencontainers.image.title=audittail" \
+            --label "org.opencontainers.image.revision=${revision}" \
+            --label "org.opencontainers.image.version=${GITHUB_REF_NAME}" \
+            --label "org.opencontainers.image.licenses=MIT" \
+            --label "org.opencontainers.image.vendor=Equinix, Inc." \
+            .
+
+      - name: Publish Container images
+        run: docker push "${AUDITTAIL_IMAGE_NAME}" --all-tags