test: add tirvy vulnerability scanner github action

fix typo

Author: andyzhangx

.github/workflows/trivy.yaml

@@ -0,0 +1,55 @@
+name: Trivy vulnerability scanner
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.16
+      
+      - name: Build images from Dockerfile
+        run: |
+          make
+          docker build -t test/csi-snapshotter:latest -f ./cmd/csi-snapshotter/Dockerfile --output=type=docker --label revision=latest .
+          docker build -t test/snapshot-controller:latest -f ./cmd/snapshot-controller/Dockerfile --output=type=docker --label revision=latest .
+          docker build -t test/snapshot-validation-webhook:latest -f ./cmd/snapshot-validation-webhook/Dockerfile --output=type=docker --label revision=latest .
+
+      - name: Run Trivy vulnerability scanner on csi-snapshotter image
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: 'test/csi-snapshotter:latest'
+          format: 'table'
+          exit-code: '1'
+          ignore-unfixed: true
+          vuln-type: 'os,library'
+          severity: 'CRITICAL,HIGH,MEDIUM,LOW,UNKNOWN'
+
+      - name: Run Trivy vulnerability scanner on snapshotter-controller image
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: 'test/snapshot-controller:latest'
+          format: 'table'
+          exit-code: '1'
+          ignore-unfixed: true
+          vuln-type: 'os,library'
+          severity: 'CRITICAL,HIGH,MEDIUM,LOW,UNKNOWN'
+
+      - name: Run Trivy vulnerability scanner on snapshot-validation-webhook image
+        uses: aquasecurity/trivy-action@master
+        with:
+          image-ref: 'test/snapshot-validation-webhook:latest'
+          format: 'table'
+          exit-code: '1'
+          ignore-unfixed: true
+          vuln-type: 'os,library'
+          severity: 'CRITICAL,HIGH,MEDIUM,LOW,UNKNOWN'