feat(executor)!: Switch to alpine base image. Closes #5720

[alexec]

The primary benefit is reducing the attack surface and therefore reducing the number of vulnerabilities:

Testing argoproj/argoexec:latest...

Organization:      argoproj
Package manager:   apk
Project name:      docker-image|argoproj/argoexec
Docker image:      argoproj/argoexec:latest
Platform:          linux/amd64
Licenses:          enabled

✓ Tested 32 dependencies for known issues, no vulnerable paths found.

Secondary benefits:

• Reduced build time.
• Reduced image size -> reduced start-up time. 429M -> 284.1M (ish)

[codecov]

Codecov Report

Merging #5726 (cd9c8ad) into master (d7c5cf6) will decrease coverage by 0.53%.
The diff coverage is n/a.

❗ Current head cd9c8ad differs from pull request most recent head 19692a2. Consider uploading reports for the commit 19692a2 to get more accurate results

@@            Coverage Diff             @@
##           master    #5726      +/-   ##
==========================================
- Coverage   47.35%   46.81%   -0.54%     
==========================================
  Files         248      244       -4     
  Lines       15655    15220     -435     
==========================================
- Hits         7413     7126     -287     
+ Misses       7312     7188     -124     
+ Partials      930      906      -24     

Impacted Files	Coverage Δ
cmd/argo/commands/stop.go	0.00% <0.00%> (-55.39%)	⬇️
cmd/argo/commands/resubmit.go	0.00% <0.00%> (-48.06%)	⬇️
cmd/argo/commands/retry.go	0.00% <0.00%> (-43.04%)	⬇️
cmd/argo/commands/list.go	46.42% <0.00%> (-2.39%)	⬇️
server/workflow/workflow_server.go	40.45% <0.00%> (-2.28%)	⬇️
workflow/executor/resource.go	22.80% <0.00%> (-2.20%)	⬇️
server/artifacts/artifact_server.go	57.27% <0.00%> (-2.05%)	⬇️
workflow/controller/steps.go	70.50% <0.00%> (-1.80%)	⬇️
workflow/controller/exec_control.go	51.08% <0.00%> (-1.55%)	⬇️
pkg/apis/workflow/v1alpha1/workflow_types.go	46.04% <0.00%> (-0.98%)	⬇️
... and 27 more

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[terrytangyuan]

Removing this would break backwards compatibility for users who are using jq<=1.6?

edit: nvm, looks like 1.6 is the latest release and there hasn’t been any new release for three years.