wip

The previous implementation using inline variable assignment and printf
caused issues with custom tmux configs containing special characters:

1. `TMUX_CONFIG="${TMUX_CONFIG}"` - Terraform's templatefile substitutes
   the multi-line config inline, causing bash to interpret tmux commands
   (like `set -g`, `bind C-s`) as shell commands.

2. `printf "$TMUX_CONFIG"` - The `%` character in tmux's default
   horizontal split keybind (`bind %`) is interpreted as a printf format
   specifier, corrupting the output.

Changes:
- Use heredoc with `read -r -d ''` for safe variable assignment
- Use `cat <<<` instead of `printf` for output
- Add `|| true` to handle read's non-zero exit on EOF

registry/anomaly/modules/tmux/main.tf

@@ -55,7 +55,7 @@ resource "coder_script" "tmux" {
   display_name = "tmux"
   icon         = "/icon/terminal.svg"
   script = templatefile("${path.module}/scripts/run.sh", {
-    TMUX_CONFIG   = var.tmux_config
+    TMUX_CONFIG   = base64encode(var.tmux_config)
     SAVE_INTERVAL = var.save_interval
   })
   run_on_start = true

registry/anomaly/modules/tmux/scripts/run.sh

@@ -4,7 +4,7 @@ BOLD='\033[0;1m'
 
 # Convert templated variables to shell variables
 SAVE_INTERVAL="${SAVE_INTERVAL}"
-TMUX_CONFIG="${TMUX_CONFIG}"
+TMUX_CONFIG=$(echo -n "${TMUX_CONFIG}" | base64 -d)
 
 # Function to install tmux
 install_tmux() {
@@ -73,7 +73,7 @@ setup_tmux_config() {
   mkdir -p "$config_dir"
 
   if [ -n "$TMUX_CONFIG" ]; then
-    printf "$TMUX_CONFIG" > "$config_file"
+    cat <<< "$TMUX_CONFIG" > "$config_file"
     printf "$${BOLD}Custom tmux configuration applied at {$config_file} \n\n"
   else
     cat > "$config_file" << EOF