Run builds and CI on feature-* branches

[nscuro]

Description

Runs builds and CI on feature-* branches.

This allows contributors to collaborate on branches that are not master, and still profit from CI runs and container images being published.

Names of feature branches are required to be prefixed with feature-. Container images built from them will be published using the branch name as tag.

This approach has been implemented in Hyades already:

• Run builds and CI on feature branches hyades-apiserver#651
• Run builds and CI on feature branches hyades#1192

Addressed Issue

Closes #2972

Additional Details

N/A

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅ (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (ff22d4f)	22069	16756	75.93%
Head commit (8d652e2)	22069 (+0)	16756 (+0)	75.93% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3672)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

_{Codacy will stop sending the deprecated coverage status from June 5th, 2024. Learn more}