docs(pack-images): change codename var

Author: duanhongyi

README.md

@@ -6,36 +6,36 @@ This repository is responsible for building and publishing images that builds
 with [Cloud Native Buildpacks'](https://buildpacks.io)
 [`pack`](https://github.com/buildpacks/pack) command.
 
-* [drycc/pack:codename](https://hub.docker.com/r/drycc/pack/tags/) - A CNB
-  compatible run image based on drycc/pack:codename
-* [drycc/pack:codename-build](https://hub.docker.com/r/drycc/pack/tags/) - A CNB
-  compatible build image based on drycc/pack:codename-build
+* [drycc/pack:$codename](https://hub.docker.com/r/drycc/pack/tags/) - A CNB
+  compatible run image based on drycc/pack:$codename
+* [drycc/pack:$codename-build](https://hub.docker.com/r/drycc/pack/tags/) - A CNB
+  compatible build image based on drycc/pack:$codename-build
 
 ## Usage
 
-`pack build myapp --builder drycc/buildpacks:codename`
+`pack build myapp --builder drycc/buildpacks:$codename`
 
 ## System
 
 The basic image is based on Debian system, See the table below for system description：
 
-STACK ID        | Buildpacks image                            | Operating System
-----------------|---------------------------------------------|---------------------------------
-drycc-codename  | registry.drycc.cc/drycc/buildpacks:codename | Debian 11 codename 
+STACK ID        | Buildpacks image                              | Operating System
+----------------|-----------------------------------------------|---------------------------------
+drycc-$codename  | registry.drycc.cc/drycc/buildpacks:$codename | Debian $version $codename 
 
 The basic layer of buildpack supports custom software sources and custom software.
 For example, if we use alicloud to install libpq-dev, we can add `.deb-list` and `·source-list` files to the project.
 
 ```
 cat > ".source-list" <<EOL
-deb http://mirrors.cloud.aliyuncs.com/debian/ codename main non-free contrib
-deb-src http://mirrors.cloud.aliyuncs.com/debian/ codename main non-free contrib
-deb http://mirrors.cloud.aliyuncs.com/debian-security codename/updates main
-deb-src http://mirrors.cloud.aliyuncs.com/debian-security codename/updates main
-deb http://mirrors.cloud.aliyuncs.com/debian/ codename-updates main non-free contrib
-deb-src http://mirrors.cloud.aliyuncs.com/debian/ codename-updates main non-free contrib
-deb http://mirrors.cloud.aliyuncs.com/debian/ codename-backports main non-free contrib
-deb-src http://mirrors.cloud.aliyuncs.com/debian/ codename-backports main non-free contrib
+deb http://mirrors.cloud.aliyuncs.com/debian/ $codename main non-free contrib
+deb-src http://mirrors.cloud.aliyuncs.com/debian/ $codename main non-free contrib
+deb http://mirrors.cloud.aliyuncs.com/debian-security $codename/updates main
+deb-src http://mirrors.cloud.aliyuncs.com/debian-security $codename/updates main
+deb http://mirrors.cloud.aliyuncs.com/debian/ $codename-updates main non-free contrib
+deb-src http://mirrors.cloud.aliyuncs.com/debian/ $codename-updates main non-free contrib
+deb http://mirrors.cloud.aliyuncs.com/debian/ $codename-backports main non-free contrib
+deb-src http://mirrors.cloud.aliyuncs.com/debian/ $codename-backports main non-free contrib
 EOL
 
 cat > ".deb-list" <<EOL
@@ -48,6 +48,5 @@ EOL
 Pack Images bundles the following technologies together into a single cohesive distribution:
 
 * [Stack Images](https://github.com/drycc/stack-images)
-* [Pack Runtimes](https://github.com/drycc/pack-runtimes)
 * [Pack CLI](https://github.com/buildpacks/pack)
 * [Buildpacks lifecycle](https://github.com/buildpacks/lifecycle)