Enable periodic builds of release branches

[JohnStrunk]

Describe what this PR does

• Enable triggering docs and operator flows manually. This is needed for upcoming scheduled builds
• Consolidate the container push jobs and turn them into a re-usable action to cut down on code duplication

Is there anything that requires special attention?

• The "Periodic" job isn't triggering the release-* branches yet because this PR needs to be backported to release-0.4 so that "workflow_dispatch" is enabled for the operator and documentation workflows on that branch. Once that is done, the 2 lines in periodic can be uncommented.

Related issues:
Fixes #266

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
2.3% Duplication

[codecov]

Codecov Report

Merging #307 (692ffeb) into main (c43b146) will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            main    #307     +/-   ##
=======================================
- Coverage   64.0%   64.0%   -0.1%     
=======================================
  Files         43      43             
  Lines       5056    5056             
=======================================
- Hits        3239    3236      -3     
- Misses      1623    1626      +3     
  Partials     194     194             

Impacted Files	Coverage Δ
controllers/mover/syncthing/mover.go	79.4% <0.0%> (-0.6%)	⬇️

[JohnStrunk]

/cc @tesshuflower
There's a lot of change to the workflows here. I did my best to test things in a separate repo, but it's still 🤞

[JohnStrunk]

/retest
Due to #309

[openshift-ci]

@JohnStrunk: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-openshift	692ffeb	link	false	/test e2e-openshift

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[tesshuflower]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnStrunk, tesshuflower

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