[skip ci] Update build Milvus with Docker README (#6400)

Signed-off-by: quicksilver <zhifeng.zhang@zilliz.com>

.github/workflows/publish-builder.yaml

@@ -8,11 +8,13 @@ on:
     paths:
       - 'build/docker/builder/**'
       - '.github/workflows/publish-builder.yaml'
+      - '!**.md'
   pull_request:
     # file paths to consider in the event. Optional; defaults to all.
     paths:
       - 'build/docker/builder/**'
       - '.github/workflows/publish-builder.yaml'
+      - '!**.md'
 
 jobs:
   publish-builder:

.github/workflows/publish-krte-images.yaml

@@ -8,11 +8,13 @@ on:
     paths:
       - 'build/docker/krte/**'
       - '.github/workflows/publish-krte-images.yaml'
+      - '!**.md'
   pull_request:
     # file paths to consider in the event. Optional; defaults to all.
     paths:
       - 'build/docker/krte/**'
       - '.github/workflows/publish-krte-images.yaml'
+      - '!**.md'
 
 jobs:
   publish-krte-images:

.github/workflows/publish-test-images.yaml

@@ -9,12 +9,14 @@ on:
       - 'tests/docker/Dockerfile'
       - 'tests/python_test/requirements.txt'
       - '.github/workflows/publish-test-images.yaml'
+      - '!**.md'
   pull_request:
     # file paths to consider in the event. Optional; defaults to all.
     paths:
       - 'tests/docker/Dockerfile'
       - 'tests/python_test/requirements.txt'
       - '.github/workflows/publish-test-images.yaml'
+      - '!**.md'
 
 jobs:
   publish-pytest-images:

build/README.md

@@ -1,4 +1,4 @@
-# Building Milvus
+# Building Milvus with Docker
 
 Building Milvus is easy if you take advantage of the containerized build environment. This document will help guide you through understanding this build process.
 
@@ -64,6 +64,7 @@ The following scripts are found in the [`build/`](.) directory. Note that all sc
   * `build/builder.sh make unittest`: Run all unit tests
   * `build/builder.sh make clean`: Clean up all the generated files
 
+You can specify a different OS for builder by setting OS_NAME which defaults to `ubuntu18.04`. Valid OS name are `ubuntu18.04`, `centos7`.
 
 ## E2E Tests