Add develop mode to dev script

[simonrw]

Motivation

It is sometimes nice to attach a remote debugger to a running container. For this we can use the DEVELOP=1 flag with the CLI, which

• installs debugpy into the container before infrastructure startup, and
• publishes port 5678 (the default DAP port) to the host.

These two commands can be added to the debug script, however it is marginally annoying. And of course we know that developers hate to be mildy annoyed... 😂

Changes

• Add a --develop/--no-develop flag to the CLI which performs the two above steps

Testing

python -m localstack.dev.run --develop`

should allow for remote debugging via the DAP protocol. Specifically it should:

• install debugpy into the container, and
• publish port 5678

[coveralls]

coverage: 82.997% (-0.01%) from 83.008% when pulling 02f9d71 on dev-develop-mode into dcd9f15 on master.

[github-actions]

LocalStack Community integration with Pro

       2 files  ±0         2 suites  ±0   1h 11m 36s ⏱️ - 2m 7s
2 222 tests ±0  1 725 ✔️ ±0  497 💤 ±0  0 ❌ ±0 
2 223 runs  ±0  1 725 ✔️ ±0  498 💤 ±0  0 ❌ ±0 

Results for commit 02f9d71. ± Comparison against base commit dcd9f15.

[thrau]

Cool! I would argue for the dev start script this should be the default