This PR updates all GitHub Actions workflows to use the Go version specified in the go.mod file instead of maintaining a separate GO_VERSION environment variable.

Changes

All workflow files now use go-version-file: 'go.mod' for the actions/setup-go@v6 action:

- name: Set up Go
  uses: actions/setup-go@v6
  with:
    go-version-file: 'go.mod'

Previously, workflows used a GO_VERSION environment variable:

env:
  GO_VERSION: '1.25.0'

# ...

- name: Set up Go
  uses: actions/setup-go@v6
  with:
    go-version: ${{ env.GO_VERSION }}

The GO_VERSION environment variable has been removed from all workflow files, making go.mod the single source of truth for the Go toolchain version.

Benefits

• Single source of truth: The Go version is now maintained in only one place (go.mod)
• Automatic synchronization: All workflows automatically use the version specified in go.mod
• Reduced maintenance: Updating the Go version only requires changing go.mod, not every workflow file
• Follows best practices: Uses GitHub Actions' built-in support for reading Go versions from go.mod

Affected Workflows

• .github/workflows/main.yml (8 setup-go steps)
• .github/workflows/pr.yml (8 setup-go steps)
• .github/workflows/release.yml (1 setup-go step)
• .github/workflows/scan.yml (1 setup-go step)
• .github/workflows/vulncheck.yml (1 setup-go step)

All workflows have been verified to build and test successfully using Go 1.25.2 as specified in go.mod.

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