Update README.md

.github/workflows/ci-docker-image-validation.yml

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+name: Docker Image Validation
+on:
+    push:
+        branches:
+            - master
+    pull_request:
+        branches: 
+            - ci-validation-of-docker-images
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps:
+        - uses: actions/checkout@v4
+        - name: Build the Docker image
+          run: docker buildx build -t protobuf .
+
+        - name: Checkout jaeger
+          uses: actions/checkout@v4
+          with:
+            repository: jaegertracing/jaeger
+            path: jaeger
+
+        - name: Checkout jaeger-idl
+          uses: actions/checkout@v4
+          with:
+            repository: jaegertracing/jaeger-idl
+            path: jaeger-idl
+
+        - name: Build Proto in Jaeger
+          working-directory: jaeger
+          run: |
+            make init-submodules
+            make proto JAEGER_DOCKER_PROTOBUF=protobuf
+
+        - name: Build Proto in Jaeger-idl
+          working-directory: jaeger-idl
+          run: |
+            make init-submodule
+            make proto PROTOC_IMAGE=protobuf