Conditions and regex for tags

General configuration
```
1.2.3-SNAPSHOT
...

com.google.cloud.tools
jib-maven-plugin
${jib-maven-plugin.version}



latest
${GIT_LOCAL_BRANCH}

```
This is OK, but not suitable for many cases. The more productive way is to have tag with`1.2.3` for `master` and e.g. `1.2.3-my-branch-SNAPSHOT` for `my/branch`. Or something like this. We also need replace `/` to `-` because slash is incorrect for Docker naming etc.

So. It will be good to have more flexible tag settings. E.g.
```

${project.version}
${project.version}-${GIT_LOCAL_BRANCH}

```