chore: align go version handling with gitea (#226)

Aligns Go version handling with gitea, see https://github.com/go-gitea/gitea/pull/38559. `toolchain` names the build version, `go` stays the minimum.

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/226
Reviewed-by: techknowlogick <9+techknowlogick@noreply.gitea.com>
Co-authored-by: silverwind <me@silverwind.io>

.gitea/workflows/release-tag.yml

@@ -16,7 +16,8 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
-          go-version: stable
+          go-version-file: 'go.mod'
+          check-latest: true
       - name: Install GoReleaser
         run: go install github.com/goreleaser/goreleaser/v2@latest
       - name: Run GoReleaser

.gitea/workflows/test-pr.yml

@@ -11,6 +11,7 @@ jobs:
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: 'go.mod'
+          check-latest: true
       - name: lint
         run: make lint
       - name: build

Makefile

@@ -82,7 +82,12 @@ security-check: ## run security check
 .PHONY: tidy
 tidy: ## run go mod tidy
 	$(eval MIN_GO_VERSION := $(shell grep -Eo '^go\s+[0-9]+\.[0-9.]+' go.mod | cut -d' ' -f2))
+	$(eval GO_TOOLCHAIN := $(shell grep -Eo '^toolchain\s+go[0-9.]+' go.mod | cut -d' ' -f2))
 	$(GO) mod tidy -compat=$(MIN_GO_VERSION)
+	@# workaround https://github.com/golang/go/issues/75331: restore toolchain if tidy dropped it
+	@if [ -n "$(GO_TOOLCHAIN)" ] && ! grep -qE '^toolchain\s' go.mod; then \
+		$(GO) mod edit -toolchain=$(GO_TOOLCHAIN); \
+	fi
 
 .PHONY: vendor
 vendor: tidy ## tidy and verify module dependencies

go.mod

@@ -2,6 +2,8 @@ module gitea.com/gitea/gitea-mcp
 
 go 1.26.0
 
+toolchain go1.26.5
+
 require (
 	gitea.dev/sdk v1.2.0
 	github.com/mark3labs/mcp-go v0.57.0