Fix manylinux volumes [skip ci]

docker-compose.yml

@@ -426,7 +426,7 @@ services:
       PYARROW_PARALLEL: 3
       PYTHON_VERSION: ${PYTHON_VERSION:-3.6}
       UNICODE_WIDTH: ${UNICODE_WIDTH:-16}
-    volumes: &manylinux-volumes
+    volumes:
       - .:/arrow:delegated
       - ./python/manylinux1:/io:delegated
     command: &manylinux-command /io/build_arrow.sh
@@ -443,7 +443,9 @@ services:
       PYARROW_PARALLEL: 3
       PYTHON_VERSION: ${PYTHON_VERSION:-3.6}
       UNICODE_WIDTH: ${UNICODE_WIDTH:-16}
-    volumes: *manylinux-volumes
+    volumes:
+      - .:/arrow:delegated
+      - ./python/manylinux2010:/io:delegated
     command: *manylinux-command
 
   ################################## R ########################################

python/manylinux1/README.md

@@ -49,7 +49,7 @@ a dependency to a new version, we also need to adjust it. You can rebuild
 this image using
 
 ```bash
-docker-compose build python-manylinux1
+docker-compose build centos-python-manylinux1
 ```
 
 For each dependency, we have a bash script in the directory `scripts/` that
@@ -65,7 +65,7 @@ If you have write access to the Docker Hub Ursa Labs account, you can directly
 publish a build image that you built locally.
 
 ```bash
-$ docker-compose push python-manylinux1
+$ docker-compose push centos-python-manylinux1
 ```
 
 ### Using quay.io to trigger and build the docker image

python/manylinux2010/README.md

@@ -69,7 +69,7 @@ If you have write access to the Docker Hub Ursa Labs account, you can directly
 publish a build image that you built locally.
 
 ```bash
-$ docker push python-manylinux2010
+$ docker push centos-python-manylinux2010
 The push refers to repository [arrowdev/arrow_manylinux2010_x86_64_base]
 a1ab88d27acc: Pushing [==============>                                    ]  492.5MB/1.645GB
 [... etc. ...]