added actions

.github/workflows/ci.yaml

@@ -0,0 +1,92 @@
+name: Docker Image CI
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - '*'
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+  pull_request:
+    branches:
+      - '*'
+
+
+jobs:
+
+  lint:
+
+    runs-on: ubuntu-latest
+    steps: 
+    - name: Checkout
+      uses: actions/checkout@master
+    - name: lint
+      uses: luke142367/Docker-Lint-Action@v1.0.0
+      with:
+        target: Dockerfile
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: |
+          piccio/shell-tools
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+    - name: Login to Docker Hub
+      uses: docker/login-action@v3
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+    - name: Build and push
+      id: docker_build
+      uses: docker/build-push-action@v5
+      with:
+        context: ./
+        file: ./Dockerfile
+        push: true
+        tags: piccio/cn-exercise:${{ github.ref_name }}
+      if: github.event_name != 'pull_request'
+
+  security:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Docker meta
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: |
+          piccio/cn-exercise
+        tags: |
+          type=ref,event=branch
+          type=ref,event=pr
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+    - name: Run Trivy vulnerability scanner
+      uses: aquasecurity/trivy-action@0.24.0
+      with:
+        image-ref: piccio/cn-exercise:${{ github.ref_name }}
+        format: 'table'
+        exit-code: '1'
+        ignore-unfixed: true
+        vuln-type: 'os,library'
+        severity: 'CRITICAL,HIGH'
+        scan-ref: .
+      if: github.event_name != 'pull_request'
+
+