chore: Update action metadata (#3)

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

action.yaml

@@ -1,16 +1,23 @@
 name: 'Trivy Vulnerability Scanner'
 description: 'Scan container image for vulnerabilities with Trivy'
-author: 'Daniel Pacak'
+author: 'Aqua Security'
 inputs:
-  image-ref: # Docker image reference, e.g. alpine:3.10.2
-    description: 'Docker image reference'
+  image-ref:
+    description: 'image reference'
     required: true
   exit-code:
-    description: 'Exit code'
+    description: 'exit code when vulnerabilities were found'
     required: false
     default: '0'
+  format:
+    description: 'output format (table, json)'
+    required: false
+    default: 'table'
 runs:
   using: 'docker'
   image: 'docker://docker.io/aquasec/trivy:latest'
   args:
-    - --exit-code ${{ inputs.exit-code }} ${{ inputs.image-ref }}
+    - 'image'
+    - '--format=${{ inputs.format }}'
+    - '--exit-code=${{ inputs.exit-code }}'
+    - '${{ inputs.image-ref }}'