[Doc]Update Docker Env to env-1.2 (apache#2817)

README.md

@@ -54,22 +54,23 @@ And then you could build Doris as following steps:
 #### Step1: Pull the docker image with Doris building environment
 
 ```
-$ docker pull apachedoris/doris-dev:build-env-1.1
+$ docker pull apachedoris/doris-dev:build-env-1.2
 ```
 
 You can check it by listing images, for example:
 
 ```
 $ docker images
 REPOSITORY              TAG                 IMAGE ID            CREATED             SIZE
-apachedoris/doris-dev   build-env-1.1       fed800438171        7 weeks ago         4.01GB
+apachedoris/doris-dev   build-env-1.2       69cf7fff9d10        2 weeks ago         4.12GB
 ```
 > NOTE: You may have to use different images to compile from source.
 >
 > | image version | commit id | release version |
 > |---|---|---|
 > | apachedoris/doris-dev:build-env | before [ff0dd0d](https://github.com/apache/incubator-doris/commit/ff0dd0d2daa588f18b6db56f947e813a56d8ec81) | 0.8.x, 0.9.x |
-> | apachedoris/doris-dev:build-env-1.1 | [ff0dd0d](https://github.com/apache/incubator-doris/commit/ff0dd0d2daa588f18b6db56f947e813a56d8ec81) or later | 0.10.x or later |
+> | apachedoris/doris-dev:build-env-1.1 | [ff0dd0d](https://github.com/apache/incubator-doris/commit/ff0dd0d2daa588f18b6db56f947e813a56d8ec81) or later | 0.10.x or 0.11.x |
+> | apachedoris/doris-dev:build-env-1.2 | [1648226](https://github.com/apache/incubator-doris/commit/1648226927c5b4e33f33ce2e12bf0e06369b7f6e) or later | 0.12.x or later |
 
 
 
@@ -79,13 +80,13 @@ apachedoris/doris-dev   build-env-1.1       fed800438171        7 weeks ago
 You can run the image directly:
 
 ```
-$ docker run -it apachedoris/doris-dev:build-env-1.1
+$ docker run -it apachedoris/doris-dev:build-env-1.2
 ```
 
 Or if you want to compile the source located in your local host, you can map the local directory to the image by running:
 
 ```
-$ docker run -it -v /your/local/path/incubator-doris-DORIS-x.x.x-release/:/root/incubator-doris-DORIS-x.x.x-release/ apachedoris/doris-dev:build-env-1.1
+$ docker run -it -v /your/local/path/incubator-doris-DORIS-x.x.x-release/:/root/incubator-doris-DORIS-x.x.x-release/ apachedoris/doris-dev:build-env-1.2
 ```
 
 #### Step3: Download Doris source