Revise workflows (#99)

.github/workflows/security.yml

@@ -1,6 +1,20 @@
 name: Security scan of Docker image
 on:
   push:
+    branches: [master]
+    paths-ignore:
+      - .github/workflows/buildx-release.yml
+      - .github/workflows/dockerhub-description.yml
+      - .github/workflows/greetings.yml
+      - .github/workflows/labels.yml
+      - .github/workflows/misspell.yml
+      - .github/workflows/security.yml
+      - .dockerignore
+      - .gitignore
+      - docker-compose.yml
+      - LICENSE
+      - README.md
+      - title.svg
   schedule:
     - cron: '0 9 * * *'
 jobs: