Build base images for OSS

[oseoin]

Proposed changes

Builds the common target for each OS/flavour which will be consumed in a later PR. This will avoid rebuilding the same layers for each new branch and should reduce cache usage (and hopefully reduce cache 429s as a result). The tags used include a trimmed version of the hash of the dockerfile + version file, which means that any branch consuming these images will use the correct version for the current state of the branch.

This has been tested with a manual trigger of the workflow, which resulted in the following images being built and stored:

OSS:
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/oss:d41d8cd9-debian
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/oss:d41d8cd9-alpine
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/oss:d41d8cd9-ubi

Plus:
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-debian-plus
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-ubi-plus
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-alpine-plus
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-alpine-plus-fips

NAP:
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-debian-plus-nap-dos
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-debian-plus-nap-waf
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-debian-plus-nap-waf-dos
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-alpine-plus-nap-fips-waf
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-ubi-9-plus-nap-waf
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-ubi-8-plus-nap-dos
gcr.io/f5-gcs-7899-ptg-ingrss-ctlr/dev/nginx-ic-base/plus:d41d8cd9-ubi-8-plus-nap-waf-dos

This PR also renames alpine-plus-nap-waf-fips to alpine-plus-nap-fips for consistency - this is only used internally and will not impact the name of released images.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (515a7e3) 52.31% compared to head (bb6f86f) 52.28%.
Report is 14 commits behind head on main.

❗ Current head bb6f86f differs from pull request most recent head 4a6119a. Consider uploading reports for the commit 4a6119a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4999      +/-   ##
==========================================
- Coverage   52.31%   52.28%   -0.03%     
==========================================
  Files          60       60              
  Lines       17501    17501              
==========================================
- Hits         9155     9151       -4     
- Misses       8018     8020       +2     
- Partials      328      330       +2     

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