build: reduce release binary size by stripping symbols, trimming paths, and upx on release

[Code0x58]

Motivation

• Reduce the size of release artifacts by removing debug symbols and embedded build metadata while keeping runtime compatibility intact.
• Ensure reproducible and smaller Docker/GoReleaser builds for an infrequently used, network-bound tool where runtime speed is not a priority.

Description

• Added build flags in .goreleaser.yml to remove local path and VCS metadata (-trimpath, -buildvcs=false) and to pass linker flags (-s -w -buildid=) while injecting main.version at link time via -X main.version={{ .Version }}.
• Updated the Dockerfile build command to align with the same size-focused flags (-trimpath -buildvcs=false -tags netgo -ldflags '-s -w -buildid=') to produce smaller release images.
• Kept CGO_ENABLED=0 and target platforms unchanged to preserve compatibility and static build behavior.

Testing

• Ran go build ./... which completed successfully.

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Codex Task