Add workflows (#2)

.github/workflows/build.yaml

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+# Build the rock
+name: Build
+
+on:
+  workflow_call:
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Get name
+        id: name
+        run: echo "name=$(yq '.name' rockcraft.yaml)" >> "$GITHUB_OUTPUT"
+
+      - uses: canonical/craft-actions/rockcraft-pack@main
+        id: rockcraft
+
+      - name: Install Syft
+        run: |
+          curl -sSfL https://raw.githubusercontent.com/anchore/syft/main/install.sh | sh -s -- -b /usr/local/bin
+
+      - name: Create SBOM
+        run: syft ${{ steps.rockcraft.outputs.rock }} -o spdx-json=${{ steps.name.outputs.name }}.sbom.json
+
+      - name: Upload SBOM
+        uses: actions/upload-artifact@v3
+        with:
+          name: ${{ steps.name.outputs.name }}-sbom
+          path: "${{ steps.name.outputs.name }}.sbom.json"
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: rock
+          path: ${{ steps.rockcraft.outputs.rock }}

.github/workflows/publish.yaml

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+# Publish the rock image to ghcr
+name: Publish
+
+on:
+  workflow_call:
+
+jobs:
+  publish:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Install skopeo
+        run: |
+          sudo snap install --devmode --channel edge skopeo
+
+      - name: Install yq
+        run: |
+          sudo snap install yq
+
+      - uses: actions/download-artifact@v3
+        with:
+          name: rock
+
+      - name: Import and push to github package
+        run: |
+          image_name="$(yq '.name' rockcraft.yaml)"
+          version="$(yq '.version' rockcraft.yaml)"
+          rock_file=$(ls *.rock | tail -n 1)
+          sudo skopeo \
+            --insecure-policy \
+            copy \
+            oci-archive:"${rock_file}" \
+            docker-daemon:"ghcr.io/canonical/${image_name}:${version}"
+          docker push ghcr.io/canonical/${image_name}:${version}

.github/workflows/push_any.yaml

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+name: Push (any)
+
+# When pushing to any branch other than "main", we:
+# * build the rock image
+
+on:
+  push:
+    branches-ignore:
+      - "main"
+    paths:
+      - "rockcraft.yaml"
+      - ".github/workflows/**.yaml"
+
+jobs:
+  build:
+    uses: ./.github/workflows/build.yaml

.github/workflows/push_main.yaml

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+name: Push (main)
+
+# When pushing to the "main" branch, we:
+# * build the rock image
+# * publish the image
+# * scan the image and upload the artifacts to the repository
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "rockcraft.yaml"
+      - ".github/workflows/**.yaml"
+  workflow_dispatch:
+
+jobs:
+  build:
+    uses: ./.github/workflows/build.yaml
+
+  publish:
+    needs: build
+    uses: ./.github/workflows/publish.yaml
+
+  scan:
+    needs: publish
+    uses: ./.github/workflows/scan.yaml

.github/workflows/scan.yaml

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+# Scan the published rock image and upload the results
+name: Scan
+
+on:
+  workflow_call:
+
+jobs:
+  scan:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Get name and version
+        id: image_info
+        run: |
+          echo "image_name=$(yq '.name' rockcraft.yaml)" >> "$GITHUB_OUTPUT"
+          echo "version=$(yq '.version' rockcraft.yaml)" >> "$GITHUB_OUTPUT"
+
+      - name: Scan image with Trivy
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: "ghcr.io/canonical/${{ steps.image_info.outputs.image_name }}:${{ steps.image_info.outputs.version }}"
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+
+      - name: Upload scan results to GitHub
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: 'trivy-results.sarif'