feat(sansec-ecomscan): add sansec ecomscan feature (#235)

sansec-ecomscan/README.md

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+# Sansec eComscan Security Scan Action
+
+A Github Action that runs the [Sansec eComscan](https://sansec.io/ecomscan) security scanner.
+
+## Inputs
+
+See the [action.yml](./action.yml)
+
+## Usage
+
+The caller is responsible for checking out the repository before calling this action. A valid Sansec license key must be passed via the `ecomscan_key` input.
+
+The `path` input should point to the root of the Magento installation — the directory that contains `app/`, `vendor/`, etc. It defaults to `.` (the current working directory).
+
+```yml
+name: Sansec eComscan Security Scan
+
+on:
+  push:
+  pull_request_target:
+  workflow_dispatch:
+
+jobs:
+  run-ecomscan:
+    # Skip if it's a push event on a PR (it can't access secrets)
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: graycoreio/github-actions-magento2/sansec-ecomscan@7.1.0
+        with:
+          license: ${{ secrets.SANSEC_LICENSE_KEY }}
+```

sansec-ecomscan/action.yml

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+name: "Sansec eComscan Security Scan"
+author: "Graycore"
+description: "A Github Action that runs the Sansec eComscan security scanner."
+
+inputs:
+  license:
+    required: true
+    description: "Sansec license key (ECOMSCAN_KEY)"
+
+  path:
+    required: true
+    default: '.'
+    description: "The directory to scan."
+
+  skip_database:
+    required: false
+    default: 'true'
+    description: "Skip the database scan (--skip-database). Defaults to true."
+
+runs:
+  using: composite
+  steps:
+    - name: Download eComscan
+      shell: bash
+      run: wget https://ecomscan.com/downloads/linux-amd64/ecomscan
+
+    - name: Fix permissions
+      shell: bash
+      run: chmod +x ecomscan
+
+    - name: Run eComscan
+      shell: bash
+      env:
+        ECOMSCAN_KEY: ${{ inputs.license }}
+      run: |
+        FLAGS=(--no-auto-update --deep --format=csv)
+        [ "${{ inputs.skip_database }}" = "true" ] && FLAGS+=(--skip-database)
+        output=$(./ecomscan "${FLAGS[@]}" "${{ inputs.path }}")
+        if [ -n "$output" ]; then
+          echo "Security issues found:"
+          echo "$output"
+          exit 1
+        fi
+
+branding:
+  icon: "shield"
+  color: "red"