fix: embed timezone database via time/tzdata (#476)

Fixes #470

Author: mtojek

integration/integration_test.go

@@ -99,7 +99,7 @@ func TestIntegration(t *testing.T) {
 				"workspace_preset.parameters.param":                         `preset param value`,
 				"workspace_preset.prebuilds.instances":                      `1`,
 				"workspace_preset.prebuilds.expiration_policy.ttl":          `86400`,
-				"workspace_preset.prebuilds.scheduling.timezone":            `UTC`,
+				"workspace_preset.prebuilds.scheduling.timezone":            `America/New_York`,
 				"workspace_preset.prebuilds.scheduling.schedule0.cron":      `\* 8-18 \* \* 1-5`,
 				"workspace_preset.prebuilds.scheduling.schedule0.instances": `3`,
 				"workspace_preset.prebuilds.scheduling.schedule1.cron":      `\* 8-14 \* \* 6`,

integration/test-data-source/main.tf

@@ -34,7 +34,7 @@ data "coder_workspace_preset" "preset" {
       ttl = 86400
     }
     scheduling {
-      timezone = "UTC"
+      timezone = "America/New_York"
       schedule {
         cron      = "* 8-18 * * 1-5"
         instances = 3

main.go

@@ -2,6 +2,9 @@ package main
 
 import (
 	"flag"
+	// Embed timezone data for use in environments that may not have the
+	// timezone database available (e.g. scratch Docker images).
+	_ "time/tzdata"
 
 	"github.com/hashicorp/terraform-plugin-sdk/v2/plugin"