Add Docker build test

.github/workflows/docker_build.yml

@@ -0,0 +1,17 @@
+on: [push, pull_request]
+name: Test Dockerfiles
+permissions:
+  contents: read
+jobs:
+  docker_build:
+    steps:
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Build leaf_validator
+      uses: docker/build-push-action@v5
+      with:
+        context: "{{defaultContext}}:deploy/github/log/leaf_validator"
+    - name: Build sequence_and_integrate
+      uses: docker/build-push-action@v5
+      with:
+        context: "{{defaultContext}}:deploy/github/log/sequence_and_integrate"