renovate: fix renovate upgrade of Go toolchain

PR #1536 broke "renovate update Go toolchain in a single PR" from #1259
because in the actual state it could only bump the go directive from
minor versions, not bumping the patch needed by the workflows github
actions reading that version.

From cilium/cilium@2f7e2f3:
According to [1] as of Go 1.21 we either need to specify the full
toolchain version in the `go` directive or add a `toolchain` directive
with the concrete toolchain version. Opt for the former and make sure
it's kept up to date by renovate bot.

[1] golang/go#62278 (comment)

Signed-off-by: Mahe Tardy <[email protected]>

.github/renovate.json5

@@ -187,13 +187,6 @@
         "Dockerfile"
       ],
     },
-    // Upgrade the Go module directive, see:
-    // https://docs.renovatebot.com/modules/versioning/#go-modules-directive-versioning
-    // depName is 'go' so it will be group with the 'Go' groupName
-    {
-      "matchDatasources": ["golang-version"],
-      "rangeStrategy": "bump",
-    },
     {
       "groupName": "Go",
       "matchDepNames": [
@@ -349,11 +342,7 @@
         "^\\.github/workflows/[^/]+\\.ya?ml$"
       ],
       "matchStrings": [
-        // this regex is used to match both:
-        //
-        // # renovate: datasource=golang-version depName=go
-        // go: '1.20.8'
-        //
+        // this regex is used to match:
         // # renovate: datasource=docker depName=quay.io/lvh-images/kernel-images
         // - 'bpf-next-20230912.113936'
         "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\s+.+ ['\"]?(?<currentValue>[^'\"\\s]*)"
@@ -385,6 +374,16 @@
       "matchStrings": [
         "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\s+GOLANGCILINT_WANT_VERSION[[:blank:]]*=[[:blank:]]*(?<currentValue>[^\\s]*)"
       ]
+    },
+    {
+      "customType": "regex",
+      // match all go.mod in all subfolders
+      "fileMatch": [
+        "go\\.mod$"
+      ],
+      "matchStrings": [
+        "// renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\s+go (?<currentValue>.*)"
+      ]
     }
   ]
 }

api/go.mod

@@ -1,5 +1,6 @@
 module github.com/cilium/tetragon/api
 
+// renovate: datasource=golang-version depName=go
 go 1.21.1
 
 require (

contrib/rthooks/tetragon-oci-hook/go.mod

@@ -1,5 +1,6 @@
 module github.com/cilium/tetragon/contrib/rthooks/tetragon-oci-hook
 
+// renovate: datasource=golang-version depName=go
 go 1.21.1
 
 require (

go.mod

@@ -1,5 +1,6 @@
 module github.com/cilium/tetragon
 
+// renovate: datasource=golang-version depName=go
 go 1.21.1
 
 require (

pkg/k8s/go.mod

@@ -1,5 +1,6 @@
 module github.com/cilium/tetragon/pkg/k8s
 
+// renovate: datasource=golang-version depName=go
 go 1.21.1
 
 require (