chore: Init project

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

Dockerfile

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+FROM aquasec.trivy:latest

README.md

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+# Trivy GitHub Action
+

action.yaml

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+name: 'Trivy Action'
+description: 'Scan container image for vulnerabilities with Trivy'
+inputs:
+  image-ref: # Docker image reference, e.g. alpine:3.10.2
+    description: 'Docker image reference'
+outputs:
+  scan-report:
+    description: 'Vulnerability report is JSON'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.image-ref }}