Delete shiftleft-analysis.yml

Development on this stopped in 2021 and apart from the (false positive) secret scan, dev suggests CodeQL replaces it, feature wise: https://github.com/ShiftLeftSecurity/sast-scan/issues/352

.github/workflows/shiftleft-analysis.yml

@@ -1,35 +0,0 @@
-# This workflow integrates Scan with GitHub's code scanning feature
-# Scan is a free open-source security tool for modern DevOps teams from ShiftLeft
-# Visit https://slscan.io/en/latest/integrations/code-scan for help
-name: SL Scan
-
-on:
-  push:
-    branches: [ master ]
-  pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ master ]
-  schedule:
-    - cron: '16 22 * * 4'
-
-jobs:
-  Scan-Build:
-    # Scan runs on ubuntu, mac and windows
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    # potentially add composer install steo here
-    - name: Perform Scan
-      uses: ShiftLeftSecurity/scan-action@master
-      env:
-        WORKSPACE: ""
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        SCAN_AUTO_BUILD: true
-      with:
-        output: reports
-        # Scan auto-detects the languages.
-
-    - name: Upload report
-      uses: github/codeql-action/upload-sarif@v2
-      with:
-        sarif_file: reports