ci: use go.mod as source of truth for actions/setup-go action (#87574)

* ci: use go.mod as source of truth for actions/setup-go action

Signed-off-by: Dave Henderson <dave.henderson@grafana.com>

* updating upgrading-go-version.md doc

Signed-off-by: Dave Henderson <dave.henderson@grafana.com>

---------

Signed-off-by: Dave Henderson <dave.henderson@grafana.com>

.github/workflows/alerting-swagger-gen.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set go version
         uses: actions/setup-go@v4
         with:
-          go-version: '1.22.3'
+          go-version-file: go.mod
       - name: Build swagger
         run: |
           make -C pkg/services/ngalert/api/tooling post.json api.json

.github/workflows/bump-version.yml

@@ -58,7 +58,7 @@ jobs:
       # Go is required for also updating the schema versions as part of the precommit hook:
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.22.3'
+          go-version-file: go.mod
       - uses: actions/setup-node@v4
         with:
           node-version: '18'

.github/workflows/codeql-analysis.yml

@@ -48,7 +48,7 @@ jobs:
       name: Set go version
       uses: actions/setup-go@v4
       with:
-        go-version: '1.22.3'
+        go-version-file: go.mod
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/pr-codeql-analysis-go.yml

@@ -36,7 +36,7 @@ jobs:
     - name: Set go version
       uses: actions/setup-go@v4
       with:
-        go-version: '1.22.3'
+        go-version-file: go.mod
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/pr-go-workspace-check.yml

@@ -22,7 +22,7 @@ jobs:
     - name: Set go version
       uses: actions/setup-go@v4
       with:
-        go-version: '1.22.3'
+        go-version-file: go.mod
 
     - name: Workspace Sync
       run: go work sync

.github/workflows/publish-kinds-next.yml

@@ -36,7 +36,7 @@ jobs:
       - name: "Setup Go"
         uses: "actions/setup-go@v4"
         with:
-          go-version: '1.22.3'
+          go-version-file: go.mod
 
       - name: "Verify kinds"
         run: go run .github/workflows/scripts/kinds/verify-kinds.go

.github/workflows/publish-kinds-release.yml

@@ -39,7 +39,7 @@ jobs:
       - name: "Setup Go"
         uses: "actions/setup-go@v4"
         with:
-          go-version: '1.22.3'
+          go-version-file: go.mod
 
       - name: "Verify kinds"
         run: go run .github/workflows/scripts/kinds/verify-kinds.go

.github/workflows/verify-kinds.yml

@@ -18,7 +18,7 @@ jobs:
       - name: "Setup Go"
         uses: "actions/setup-go@v4"
         with:
-          go-version: '1.22.3'
+          go-version-file: go.mod
 
       - name: "Verify kinds"
         run: go run .github/workflows/scripts/kinds/verify-kinds.go

contribute/backend/upgrading-go-version.md

@@ -6,17 +6,15 @@ Example PR: https://github.com/grafana/grafana/pull/79329
 
 ## The main areas that need to change during the upgrade are:
 
-- https://github.com/grafana/grafana/blob/d8ecea4ed93efb2e4d64a5ee24bc08f3805f413d/scripts/drone/variables.star#L6
+- [`go.mod`](/go.mod#L3)
-- https://github.com/grafana/grafana/blob/d8ecea4ed93efb2e4d64a5ee24bc08f3805f413d/Makefile#L264
+- [`go.work`](/go.work#L1)
-- https://github.com/grafana/grafana/blob/d8ecea4ed93efb2e4d64a5ee24bc08f3805f413d/Dockerfile#L6
+- [`scripts/drone/variables.star`](/scripts/drone/variables.star#L6)
+- [`Makefile`](/Makefile#L12)
+- [`Dockerfile`](/Dockerfile#L6)
 
-Make sure to run `make drone` so that changes to `.star` files are reflected and `drone.yml` is generated.
+Then, run `go mod tidy` and `go work sync`. Also run `make drone` so changes to `.star` files are reflected and `drone.yml` is updated.
 
 ### Additional files to change
 
 - Take a look in `.github/workflows` folder for what `go` version is being used there in various workflows.
 - Make sure to create a PR with the corresponding changes in `grafana/grafana-enterprise` repository.
-
-## Updating the go.mod file
-
-Please avoid updating the `go.mod` to the newest version unless really necessary. This ensures backwards compatibility and introduces less breaking changes. Always upgrade Go version in the runtime files above first, let them run for a couple of weeks and only then consider updating the `go.mod` file if necessary.