adding credo workflow

code-scanning/credo.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.
+
+
+# Credo is a static code analysis tool for the Elixir language with a focus on teaching and code consistency.
+# https://github.com/rrrene/credo
+#
+# To use this workflow, you must have GitHub Advanced Security (GHAS) enabled for your repository.
+#
+# Instructions:
+# 1. Add :credo as a dependency to your project's mix.exs with version ~> 1.7.0-rc.1 - https://github.com/rrrene/credo#installation-and-usage
+# 2. Follow the annotated workflow below and make any necessary modifications then save the workflow to your repository
+#    and review the "Security" tab once the action has run.
+
+name: Credo
+
+on:
+  push:
+    branches: [ $default-branch, $protected-branches ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ $default-branch ]
+  schedule:
+    - cron: $cron-weekly
+
+permissions:
+  contents: read
+
+jobs:
+  security-scan:
+    permissions:
+      contents: read # for actions/checkout to fetch code
+      security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
+      actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        otp: [version]
+        elixir: [version]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@988e02bfe678367a02564f65ca2e37726dc0268f
+        with:
+          otp-version: ${{matrix.otp}}
+          elixir-version: ${{matrix.elixir}}
+      - name: get dependencies
+        run: mix deps.get
+      - name: compile dependencies
+        run: mix deps.compile
+      - name: compile
+        run: mix compile
+      - name: credo-scan
+        run: mix credo --format=sarif > credo_output.sarif
+      - name: upload sarif
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          # Path to SARIF file relative to the root of the repository
+          sarif_file: credo_output.sarif

code-scanning/properties/credo.properties.json

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+{
+    "name": "Credo Scan",
+    "creator": "Credo",
+    "description": "Credo is a static code analysis tool for the Elixir language with a focus on teaching and code consistency.",
+    "categories": ["Code Scanning", "Elixir"]
+}