Create semgrep.yml

.github/workflows/semgrep.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+# This workflow file requires a free account on Semgrep.dev to
+# manage rules, file ignores, notifications, and more.
+#
+# See https://semgrep.dev/docs
+
+name: Semgrep
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "master" ]
+  schedule:
+    - cron: '40 17 * * 4'
+
+permissions:
+  contents: read
+
+jobs:
+  semgrep:
+    # User-definable name of this GitHub Actions job:
+    name: Scan
+    # If you are self-hosting, change the following `runs-on` value: 
+    runs-on: ubuntu-latest
+
+    container:
+      # A Docker image with Semgrep installed. Do not change this.
+      image: returntocorp/semgrep
+
+    # To skip any PR created by dependabot to avoid permission issues:
+    if: (github.actor != 'dependabot[bot]')
+
+    steps:
+      # Fetch project source with GitHub Actions Checkout.
+      - uses: actions/checkout@v3
+      # Run the "semgrep ci" command on the command line of the docker image.
+      - run: semgrep ci --config auto
+        env:
+           # Add the rules that Semgrep uses by setting the SEMGREP_RULES environment variable. 
+           SEMGREP_RULES: p/default # more at semgrep.dev/explore
+           # Uncomment SEMGREP_TIMEOUT to set this job's timeout (in seconds):
+           # Default timeout is 1800 seconds (30 minutes).
+           # Set to 0 to disable the timeout.
+           # SEMGREP_TIMEOUT: 300