do not perform autodetection to reduce memory consuption in server

[motatoes]

autodetection with absense of digger.yml is an undocumented feature and it causes alot of memory consumption during directory walking which happens as a result. We remove it in this PR to save on server memory

[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to a5621da.

Security Overview

• 🔎 Scanned files: 2 changed file(s)

Detected Code Changes

Change Type	Relevant files
Enhancement	► github.go     Add handling for PushEvent     Implement handlePushEvent function
Refactor	► digger_config.go     Remove AutoDetectDiggerConfig function     Update LoadDiggerConfigYaml function
Other	► digger_config_test.go     Update tests to reflect changes in digger_config.go

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