Add initial version

Dockerfile

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+FROM golang AS builder
+RUN wget https://get.symfony.com/cli/installer -O - | bash
+
+FROM scratch
+COPY --from=builder /root/.symfony/bin/symfony /
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+CMD ["/symfony", "check:security"]

README.md

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+PHP Security Checker
+====================
+
+This action checks your `composer.lock` for known vulnerabilities in your package dependencies.
+
+Inputs
+------
+
+* `composer` *optional* The path to the `composer.lock` file (defaults to the repository root directory).
+* `disable-exit-code` *optional* Set it to `1` if you don't want the step to fail in case of detected vulnerabilities
+
+Outputs
+-------
+
+* `vulns` A JSON payload containing all detected vulnerabilities
+
+Usage
+-----
+
+If you want the step to fail whenever there is a security issue in one of your
+dependencies, use this action:
+
+    steps:
+        - uses: actions/checkout@v2
+        - uses: symfonycorp/security-checker-action@v1
+
+If the `composer.lock` is not in the repository root directory, pass is as an
+input:
+
+    steps:
+        - uses: actions/checkout@v2
+        - uses: symfonycorp/security-checker-action@v1
+        with:
+            lock: subdir/composer.lock
+
+Instead of failing, you can also get the vulnerabilities as a JSON output and
+do something with them in another step:
+
+    steps:
+        - uses: actions/checkout@v2
+        - uses: symfonycorp/security-checker-action@v1
+        with:
+            disable-exit-code: 1
+        id: security-check
+        - name: Display the vulnerabilities as JSON
+        run: echo ${{ steps.security-check.outputs.vulns }}

action.yml

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+name: 'The PHP Security Checker'
+description: 'Checks composer.json for known vulnerabilities in your package dependencies'
+branding:
+    icon: 'umbrella'
+    color: 'gray-dark'
+inputs:
+    lock:
+        description: 'The path to composer.lock is stored (root directory by default)'
+        required: false
+        default: './composer.lock'
+    disable-exit-code:
+        description: 'Whether to fail when issues are detected (false by default)'
+        required: false
+        default: 0
+outputs:
+    vulns:
+        description: 'The detected vulnerabilities as JSON'
+runs:
+    using: 'docker'
+    image: 'Dockerfile'
+    args:
+        - /symfony
+        - check:security
+        - "--dir"
+        - ${{ inputs.lock }}
+        - "--disable-exit-code=${{ inputs.disable-exit-code }}"