Optimize Docker image size and split into three base-line image

[jerry-yuan]

Hi, I'm back with my work update! As discussed in issue #891, I've migrated the dagu:latest image to a dagu:dev version (which includes various development tools that are unnecessary in production), and created a new Alpine-based image dagu:alpine.

After setting up GitHub Actions in my forked repository and building the three images, pulling them to my server resulted in significant size reduction and build time improvements:

jerry@docker:~$ docker images | grep dagu
ghcr.io/jerry-yuan/dagu   dev               097d153d8388   27 minutes ago   1.39GB
ghcr.io/jerry-yuan/dagu   latest            9af316925576   29 minutes ago   126MB
ghcr.io/jerry-yuan/dagu   alpine            73a5aa5de41f   30 minutes ago   58MB
jerry@docker:~$ 

Additionally, I've tested most sample workflows. The smaller alpine image performs well except for environment-dependent DAGs:

[yottahmd]

Looking great! Thank you so much for optimizing the docker image!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.38%. Comparing base (6c1a2d9) to head (93ab3a3).
Report is 8 commits behind head on dev-v1.7.0.

Additional details and impacted files

@@              Coverage Diff               @@
##           dev-v1.7.0     #895      +/-   ##
==============================================
- Coverage       55.48%   55.38%   -0.11%     
==============================================
  Files              75       80       +5     
  Lines            8240     9030     +790     
==============================================
+ Hits             4572     5001     +429     
- Misses           3281     3559     +278     
- Partials          387      470      +83     

see 45 files with indirect coverage changes

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[jerry-yuan]

@yottahmd Thanks for your code review and looking forward for dagu v1.7.0😊