Integrate with auto-release infra (#581)

## Changes
- added changelog template
- added `toolchain` to `.codegen.json`

## Tests
none

.codegen.json

@@ -6,5 +6,8 @@
     "batch": {
         ".codegen/cmds-workspace.go.tmpl": "cmd/workspace/cmd.go",
         ".codegen/cmds-account.go.tmpl": "cmd/account/cmd.go"
+    },
+    "toolchain": {
+        "required": ["go"]
     }
 }

.codegen/changelog.md.tmpl

@@ -0,0 +1,29 @@
+# Version changelog
+
+## {{.Version}}
+
+{{range .Changes -}}
+ * {{.}}.
+{{end}}{{- if .ApiChanges}}
+API Changes:
+{{range .ApiChanges}}{{if or (eq .X "method") (eq .X "service")}}
+ * {{.Action}} {{template "what" .}}{{if .Extra}} {{.Extra}}{{with .Other}} {{template "what" .}}{{end}}{{end}}.
+{{- end}}{{- end}}
+
+OpenAPI SHA: {{.Sha}}, Date: {{.Changed}}
+{{- end}}{{if .DependencyUpdates}}
+Dependency updates:
+{{range .DependencyUpdates}}
+ * {{.}}.
+{{- end -}}
+{{end}}
+
+## {{.PrevVersion}}
+
+{{- define "what" -}}
+    {{if eq .X "service" -}}
+        `databricks {{if .Service.IsAccounts}}account {{end -}}{{(.Service.TrimPrefix "account").KebabName}}` command group
+    {{- else if eq .X "method" -}}
+        `databricks {{if .Method.Service.IsAccounts}}account {{end -}}{{(.Method.Service.TrimPrefix "account").KebabName}} {{.Method.KebabName}}` command
+    {{- end}}
+{{- end -}}