Refine the .circleci/config.yml by using dynamic config

[Rueian]

Currently, we have these hard coded and repeated sections in the .circleci/config.yml for testing each go.mod.

rueidis/.circleci/config.yml

Lines 14 to 35 in 16d5f13

       - run: # test ./go.mod 
           command: | 
             list=$(go list ./... | circleci tests split --split-by=timings) 
             echo "Test Packages: $list" 
             for n in {1..5}; do ./dockertest.sh $list && break; done 
           no_output_timeout: 15m 
  
       - run: # test ./rueidishook/go.mod 
           command: | 
             cd $CIRCLE_WORKING_DIRECTORY/rueidishook 
             list=$(go list ./... | circleci tests split --split-by=timings) 
             echo "Test Packages: $list" 
             for n in {1..5}; do ../dockertest.sh $list && break; done 
           no_output_timeout: 15m 
  
       - run: # test ./mock/go.mod 
           command: | 
             cd $CIRCLE_WORKING_DIRECTORY/mock 
             list=$(go list ./... | circleci tests split --split-by=timings) 
             echo "Test Packages: $list" 
             for n in {1..5}; do ../dockertest.sh $list && break; done 
           no_output_timeout: 15m 

It will be better if we can detect every go.mod files automatically and generate .circleci/config.yml dynamically through the
https://circleci.com/docs/dynamic-config/.

[Rueian]

Here is an example of how we can detect every go.mod files:

rueidis/.github/workflows/tag-subpkg.yml

Lines 26 to 28 in 16d5f13

           find . -maxdepth 2 -type f -name "go.mod" | while read -r line; do 
             DIR_NAME=$(dirname "$line") 
             PREFIX=${DIR_NAME#"./"} # Remove leading "./" 

[Rueian]

Thank you @moonorange!