fix: example: update docker-local to use host-gateway (#1507)

* fix: example: update docker-local to use host-gateway
* docker-compose.yaml: Add POSTGRES_ environment variables to CODER_PG_CONNECTION_URL

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>

examples/docker-local/main.tf

@@ -15,6 +15,10 @@ provider "docker" {
   host = "unix:///var/run/docker.sock"
 }
 
+provider "coder" {
+  url = "http://host.docker.internal:7080"
+}
+
 data "coder_workspace" "me" {
 }
 
@@ -43,6 +47,10 @@ resource "docker_container" "workspace" {
   dns     = ["1.1.1.1"]
   command = ["sh", "-c", coder_agent.dev.init_script]
   env     = ["CODER_AGENT_TOKEN=${coder_agent.dev.token}"]
+  host {
+    host = "host.docker.internal"
+    ip   = "host-gateway"
+  }
   volumes {
     container_path = "/home/coder/"
     volume_name    = docker_volume.coder_volume.name