Workflows changes

- Simple Docker build for PRs
- Only run buildx for latest tag on pushes to master branch

.github/workflows/build.yml

@@ -0,0 +1,12 @@
+name: Docker build
+on:
+  pull_request:
+    branches: [master]
+jobs:
+  security-analysis:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Build image
+        run: docker build .

.github/workflows/buildx-latest.yml

@@ -1,20 +1,5 @@
 name: Buildx latest
 on:
-  pull_request:
-    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
   push:
     branches: [master]
     paths-ignore: