refactor: refactored get_http_dir (#360)

Closes #

## Description

<!-- Briefly describe what this PR does and why -->

I just couldn't get the script to execute properly in its current form.
I saw e.g.

```console
[[: 1989{#d[@]}: syntax error: invalid arithmetic operator (error token is "{#d[@]}")
```

when trying to run the script locally. (GNU bash, version
5.2.21(1)-release (x86_64-pc-linux-gnu)).

This uses a likely simpler bash script, but requires both grep and awk.

## Type of Change

- [ ] New module
- [x] Bug fix
- [ ] Feature/enhancement
- [ ] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/coder/modules/kasmvnc`  
**New version:** `v1.2.3`  
**Breaking change:** [ ] Yes [x] No

## Testing & Validation

- [ ] Tests pass (`bun test`)
- [ ] Code formatted (`bun run fmt`)
- [ ] Changes tested locally

## Related Issues

<!-- Link related issues or write "None" if not applicable -->

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Atif Ali <atif@coder.com>
Co-authored-by: DevCats <christofer@coder.com>

registry/coder/modules/kasmvnc/README.md

@@ -14,7 +14,7 @@ Automatically install [KasmVNC](https://kasmweb.com/kasmvnc) in a workspace, and
 module "kasmvnc" {
   count               = data.coder_workspace.me.start_count
   source              = "registry.coder.com/coder/kasmvnc/coder"
-  version             = "1.2.3"
+  version             = "1.2.4"
   agent_id            = coder_agent.example.id
   desktop_environment = "xfce"
   subdomain           = true

registry/coder/modules/kasmvnc/run.sh

@@ -60,6 +60,9 @@ install_deb() {
     sudo apt-get -o DPkg::Lock::Timeout=300 -qq update
   fi
 
+  echo "Installing required Perl DateTime module..."
+  DEBIAN_FRONTEND=noninteractive sudo apt-get -o DPkg::Lock::Timeout=300 install --yes -qq --no-install-recommends --no-install-suggests libdatetime-perl
+
   DEBIAN_FRONTEND=noninteractive sudo apt-get -o DPkg::Lock::Timeout=300 install --yes -qq --no-install-recommends --no-install-suggests "$kasmdeb"
   rm "$kasmdeb"
 }
@@ -233,19 +236,17 @@ get_http_dir() {
 
   # Check the system configuration path
   if [[ -e /etc/kasmvnc/kasmvnc.yaml ]]; then
-    d=($(grep -E "^\s*httpd_directory:.*$" /etc/kasmvnc/kasmvnc.yaml))
-    # If this grep is successful, it will return:
-    #     httpd_directory: /usr/share/kasmvnc/www
-    if [[ $${#d[@]} -eq 2 && -d "$${d[1]}" ]]; then
-      httpd_directory="$${d[1]}"
+    d=$(grep -E '^\s*httpd_directory:.*$' "/etc/kasmvnc/kasmvnc.yaml" | awk '{print $$2}')
+    if [[ -n "$d" && -d "$d" ]]; then
+      httpd_directory=$d
     fi
   fi
 
   # Check the home directory for overriding values
   if [[ -e "$HOME/.vnc/kasmvnc.yaml" ]]; then
-    d=($(grep -E "^\s*httpd_directory:.*$" "$HOME/.vnc/kasmvnc.yaml"))
-    if [[ $${#d[@]} -eq 2 && -d "$${d[1]}" ]]; then
-      httpd_directory="$${d[1]}"
+    d=$(grep -E '^\s*httpd_directory:.*$' "$HOME/.vnc/kasmvnc.yaml" | awk '{print $$2}')
+    if [[ -n "$d" && -d "$d" ]]; then
+      httpd_directory=$d
     fi
   fi
   echo $httpd_directory