Create semgrep.yml (#125)

* Create semgrep.yml

* Create .semgrepignore

.github/workflows/semgrep.yml

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+name: Semgrep
+on:
+  workflow_dispatch: {}
+  pull_request: {}
+  push:
+    branches:
+      - main
+    paths:
+      - .github/workflows/semgrep.yml
+  schedule:
+    # random HH:MM to avoid a load spike on GitHub Actions at 00:00
+    - cron: '23 18 * * *'
+jobs:
+  semgrep:
+    name: semgrep/ci
+    runs-on: ubuntu-22.04
+    env:
+      SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN }}
+    container:
+      image: semgrep/semgrep
+    if: (github.actor != 'dependabot[bot]')
+    steps:
+      - uses: actions/checkout@v3
+      - run: semgrep ci

.semgrepignore

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+# Common large paths
+node_modules/
+build/
+dist/
+vendor/
+.env/
+.venv/
+.tox/
+*.min.js
+.npm/
+.yarn/
+
+# Common test paths
+test/
+tests/
+*_test.go
+
+# Semgrep rules folder
+.semgrep
+
+# Semgrep-action log folder
+.semgrep_logs/
+
+# submodules
+/pgmodeler/
+/plugins/