Faster K3s Binary Build Option

[dereknola]

Proposed Changes

This is an attempt to make a multi-stage dockerfile that focuses on the minimal build required to produces a functional k3s binary. The use case is when developer must build k3s over and over again when developing small code changes. Images and rpm packaging is often unnecessary when all you need to do is run ./dist/artifacts/k3s server -t 12345

Speedup is achieved from the following:

• No validation of the project code
• No trivy vulnerability scanning
• Breaking the mono script ci into its components on Docker build to maximize intermediate image caching
• Using buildkit mount caching on go build calls

This is not intended as a replacement for any of the CI build process at this time.

Types of Changes

Local Build

Verification

Run make local to use the new build option

Testing

• Run on a AMD Ryzen 7 5800H
• All build/intermediate images are cleared before set of runs
• Between Run 1 and Run 2, modify pkg/etc/etcdproxy.go, rename function ETCDServerURL to ETCDServerURL1, simulating a code change
• Between Run2 and Run3, no change is made to the code, a somewhat pointless exersice, but one that shows the amount of caching
• dapper is run with SKIP_VALIDATE=true SKIP_AIRGAP=true make the current fastest way to produce a k3s binary

	dapper (master)	dapper (with this PR)	local
Run 1	4m38.98s	4m27.25s	2m45.07s
Run 2	2m30.53s	1m45.78s	0m52.79s
Run 3		1m35.29s	0m1.53s

Linked Issues

User-Facing Change

Further Comments

[dereknola]

This folder contains the bulk of the .git ~1.6GB size, but is not needed to extract the commit ID or branch when calling git status or other git info commands. Ignoring this folder enables a much lower copy of only some 40KB to docker containers and still allows use of the scripts/version.sh.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +4.36 🎉

Comparison is base (b66a118) 47.18% compared to head (b754099) 51.55%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7805      +/-   ##
==========================================
+ Coverage   47.18%   51.55%   +4.36%     
==========================================
  Files         143      143              
  Lines       14509    14509              
==========================================
+ Hits         6846     7480     +634     
+ Misses       6573     5845     -728     
- Partials     1090     1184      +94     

Flag	Coverage Δ
e2etests	49.37% <ø> (?)
inttests	44.47% <ø> (-0.08%)	⬇️
unittests	19.85% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 40 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.