EN-66034: fix release builds

[sarah-salinas]

This commit changes the build and release process to make it work with the current process:

• The image tag is in the default format for all builds ${serviceVersion}_${buildNumber}_${gitSHA.take(8)}
• The release tag is added to the commit where the version is bumped by another process
• The release builds will be triggered on a schedule by another job
• The release builds checkout the closest tag to the head of main and build on it

[sarah-salinas]

Testing

Simulated Main Build

https://jenkins-build.socrata.com/job/tileserver-branch/7/console - 🟢

Stages:

• Build
• Docker Build
• Publish: internal only
• Deploy: staging

Description: tileserver:1.2.1-SNAPSHOT_7_469a7424

Simulated Release Build

https://jenkins-build.socrata.com/job/tileserver-branch/8/console - 🟢

Stages:

• Build
• Docker Build
• Publish: all environments
• Deploy: rc

Description: tileserver:1.2.0_8_469a7424