feat: Add apps proxy local development docs

[Matovidlo]

Jira: PSGO-919

Changes:

• Add apps proxy documentation for local development.
• Include short overview of apps proxy, what is it, why we have it and how to use it.
• Add basic configuration of the apps proxy for development on local machine.

---

[jachym-tousek-keboola]

Suggested change

	- Typicall usage is to perform OIDC login through some OIDC provider (e.g Microsoft login, google login etc.)
	- Typicall usage is to perform OIDC login through some OIDC provider (e.g. Microsoft login, Google login etc.)

[jachym-tousek-keboola]

This doesn't work for me:

Error response from daemon: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: exec: "--net=my-test": executable file not found in $PATH: unknown

I'm guessing some additional setup is necessary?

[jachym-tousek-keboola]

This doesn't work either.

make: *** No rule to make target 'run-app-proxy'.  Stop.

Looks like a typo.

Suggested change

	make run-app-proxy
	make run-apps-proxy

[jachym-tousek-keboola]

However make run-apps-proxy doesn't work either:

make[1]: Entering directory '/code'
CGO_ENABLED=0 go build -v -mod mod -ldflags "-s -w" -o "./target/apps-proxy/proxy" ./cmd/apps-proxy
# cd /code; git status --porcelain
fatal: detected dubious ownership in repository at '/code'
To add an exception for this directory, call:

        git config --global --add safe.directory /code
error obtaining VCS status: exit status 128
        Use -buildvcs=false to disable VCS stamping.
make[1]: *** [Makefile:52: build-apps-proxy] Error 1
make[1]: Leaving directory '/code'

The suggested command git config --global --add safe.directory /code fixed it though.

[jachym-tousek-keboola]

Remove this extra step to obtain container id. It should be possible to just replace <containerid> with this:

$(docker ps -aqf "name=dev")

[jachym-tousek-keboola]

Good work, I just want the containerid thing automated.