Add Github Action required files and test workflow.

.github/workflows/main.yml

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+on: [push]
+
+jobs:
+  sarif:
+    runs-on: ubuntu-latest
+    name: Flawfinder
+    steps:
+      # To use this repository's private action,
+      # you must check out the repository
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Flawfinder action step
+        uses: ./ # Uses an action in the root directory
+        with:
+          command: '--version'

Dockerfile

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+# Container image that runs your code
+FROM ubuntu:20.04
+
+# Copies your code file from your action repository to the filesystem path `/` of the container
+COPY entrypoint.sh /entrypoint.sh
+
+
+RUN apt update -y
+
+RUN apt install python3-pip -y
+
+RUN pip install flawfinder
+
+# Code file to execute when the docker container starts up (`entrypoint.sh`)
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: 'Flawfinder'
+description: 'Execute Flawfinder'
+inputs:
+  command:
+    description: 'Command to be sent to Flawfinder'
+    required: false
+    default: '--help'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.command }}

entrypoint.sh

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+#!/bin/sh -l
+
+flawfinder $1
+
+echo "Executed with success."