ci: replace SourceKnight with native GitHub Actions workflow

[Rushaway]

Summary

• Replaces the SourceKnight-based build (maxime1907/action-sourceknight) with a native GitHub Actions workflow, following the pattern already validated in srcdslab/sm-plugin-AdminRoom (PR fix: Improve RegisterButton function (#29) + Small DRY darkerz7/EntWatch_DZ#30/feat: Status show ebans number of client darkerz7/EntWatch_DZ#31).
• Removes sourceknight.yaml (no .sourceknight/ directory was present) and the .sourceknight entry from .gitignore.
• No other SourceKnight references remained in the repo (README build notes were generic and needed no changes).

Plugins compiled

Target	Source file
entwatch_dz	addons/sourcemod/scripting/entwatch_dz.sp
entwatch_logs_manager	addons/sourcemod/scripting/entwatch_logs_manager.sp
VIP_EntWatch	addons/sourcemod/scripting/VIP_EntWatch.sp

SourceMod/SourcePawn compiler version: 1.12.x (sourceknight.yaml declared 1.12.0-git7137), via rumblefrog/setup-sp@v1.3.1.

Dependencies cloned

Name	Repo	Real include path used
multicolors	https://github.com/Bara/Multi-Colors	addons/sourcemod/scripting/include/ (matches yaml)
discordwebhookapi	https://github.com/Sarrus1/DiscordWebhookAPI	include/ (matches yaml)
vip_core	https://github.com/R1KO/VIP-Core	addons/sourcemod/scripting/include/ (matches yaml)
Extended-Discord	https://github.com/srcdslab/sm-plugin-Extended-Discord	addons/sourcemod/scripting/include/ (matches yaml)

All four dependency layouts matched what sourceknight.yaml declared — no non-standard nesting found.

No root-level common/ folder exists in this repo, so no common-folder packaging step was added to the workflow.

Local validation performed

Actually ran spcomp (SourcePawn Compiler 1.12.0.7246, matching the cached 1.12 binary) locally, replicating the generated workflow's build step exactly: cloned all four git dependencies for real, assembled them into addons/sourcemod/scripting/include/, and compiled all three targets with spcomp -i include -o ../plugins/<target>.smx <target>.sp. All three compiled successfully with exit code 0 and no errors:

• entwatch_dz.sp → OK
• entwatch_logs_manager.sp → OK
• VIP_EntWatch.sp → OK

Manual verification needed

• The previous SourceKnight-based ci.yml copied addons/sourcemod/translations/ and cfg/ into the release package (under a common/ structure inside the build artifact), so end-user release tarballs previously included translation files and default cfg files alongside the compiled .smx plugins. The new workflow, following the validated reference template exactly, only packages the compiled .smx files (the template's contract is: bundle a root-level common/ folder if one exists, and this repo has no such folder — it has cfg/ and addons/sourcemod/translations/ instead, which don't match that exact convention). A human should decide whether cfg/ and addons/sourcemod/translations/ should also be bundled into the release artifact (e.g. by adding a repo-specific copy step), since this is a behavior change from the previous workflow.

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