chore: align go version handling with gitea (#1144)

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/runner/pulls/1144
Reviewed-by: techknowlogick <9+techknowlogick@noreply.gitea.com>
Co-authored-by: silverwind <me@silverwind.io>

.gitea/workflows/release-nightly.yml

@@ -35,6 +35,7 @@ jobs:
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: "go.mod"
+          check-latest: true
       - name: goreleaser
         uses: goreleaser/goreleaser-action@f06c13b6b1a9625abc9e6e439d9c05a8f2190e94 # v7
         with:

.gitea/workflows/release-tag.yml

@@ -27,6 +27,7 @@ jobs:
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: "go.mod"
+          check-latest: true
       - name: Import GPG key
         id: import_gpg
         uses: crazy-max/ghaction-import-gpg@2dc316deee8e90f13e1a351ab510b4d5bc0c82cd # v7

.gitea/workflows/test.yml

@@ -21,6 +21,7 @@ jobs:
       - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version-file: 'go.mod'
+          check-latest: true
       - name: prepare anonymous docker config
         run: mkdir -p "$DOCKER_CONFIG" && echo '{}' > "$DOCKER_CONFIG/config.json"
       # Pre-pull act/runner's two largest base images so a slow pull can't dominate `make test`;

Makefile

@@ -141,7 +141,12 @@ security-check:
 
 .PHONY: tidy
 tidy: ## run go mod tidy
+	$(eval GO_TOOLCHAIN := $(shell grep -Eo '^toolchain\s+go[0-9.]+' go.mod | cut -d' ' -f2))
 	$(GO) mod tidy
+	@# workaround https://github.com/golang/go/issues/75331: restore toolchain if tidy dropped it
+	@if [ -n "$(GO_TOOLCHAIN)" ] && ! grep -qE '^toolchain\s' go.mod; then \
+		$(GO) mod edit -toolchain=$(GO_TOOLCHAIN); \
+	fi
 
 .PHONY: tidy-check
 tidy-check: tidy

go.mod

@@ -2,6 +2,8 @@ module gitea.com/gitea/runner
 
 go 1.26.0
 
+toolchain go1.26.5
+
 require (
 	connectrpc.com/connect v1.20.0
 	dario.cat/mergo v1.0.2