fix(jetbrains): scope HTTP version fetch to selected IDEs only (#822)

## Problem

The `data "http" "jetbrains_ide_versions"` resource fetches release info
from `data.services.jetbrains.com` for **all configured IDE options** at
plan time, regardless of what the user actually selected. When the API
is unreachable (air-gapped environments, DNS failures, transient
outages), this causes a fatal Terraform error that blocks the workspace
build — even when no JetBrains IDEs were selected.

## Fix

Changed the `for_each` on the HTTP data source (and all dependent
locals) from iterating over `var.options`/`var.default` to
`local.selected_ides` — the user's actual selection.

| Scenario | Before | After |
|---|---|---|
| No IDEs selected (`[]`) | 9 HTTP requests | 0 HTTP requests |
| 1 IDE selected (`["GO"]`) | 9 HTTP requests | 1 HTTP request |
| All IDEs selected | 9 HTTP requests | 9 HTTP requests |

## Validation

- All 17 existing `terraform test` cases pass
- Tested end-to-end on [dev.coder.com](https://dev.coder.com) with
Docker template:
  - `jetbrains_ides=[]` — zero HTTP requests, build succeeds
- `jetbrains_ides=["GO"]` — single HTTP request for GoLand only,
`coder_app.jetbrains["GO"]` created

Closes #821

> 🤖 This PR was created with the help of Coder Agents, and needs a human
review. 🧑💻

registry/coder/modules/jetbrains/README.md

@@ -14,7 +14,7 @@ This module adds JetBrains IDE buttons to launch IDEs directly from the dashboar
 module "jetbrains" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/jetbrains/coder"
-  version  = "1.3.0"
+  version  = "1.4.0"
   agent_id = coder_agent.main.id
   folder   = "/home/coder/project"
 }
@@ -39,7 +39,7 @@ When `default` contains IDE codes, those IDEs are created directly without user
 module "jetbrains" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/jetbrains/coder"
-  version  = "1.3.0"
+  version  = "1.4.0"
   agent_id = coder_agent.main.id
   folder   = "/home/coder/project"
   default  = ["PY", "IU"] # Pre-configure PyCharm and IntelliJ IDEA
@@ -52,7 +52,7 @@ module "jetbrains" {
 module "jetbrains" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/jetbrains/coder"
-  version  = "1.3.0"
+  version  = "1.4.0"
   agent_id = coder_agent.main.id
   folder   = "/home/coder/project"
   # Show parameter with limited options
@@ -66,7 +66,7 @@ module "jetbrains" {
 module "jetbrains" {
   count         = data.coder_workspace.me.start_count
   source        = "registry.coder.com/coder/jetbrains/coder"
-  version       = "1.3.0"
+  version       = "1.4.0"
   agent_id      = coder_agent.main.id
   folder        = "/home/coder/project"
   default       = ["IU", "PY"]
@@ -81,7 +81,7 @@ module "jetbrains" {
 module "jetbrains" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/jetbrains/coder"
-  version  = "1.3.0"
+  version  = "1.4.0"
   agent_id = coder_agent.main.id
   folder   = "/workspace/project"
 
@@ -108,7 +108,7 @@ module "jetbrains" {
 module "jetbrains_pycharm" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/jetbrains/coder"
-  version  = "1.3.0"
+  version  = "1.4.0"
   agent_id = coder_agent.main.id
   folder   = "/workspace/project"
 
@@ -128,7 +128,7 @@ Add helpful tooltip text that appears when users hover over the IDE app buttons:
 module "jetbrains" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/jetbrains/coder"
-  version  = "1.3.0"
+  version  = "1.4.0"
   agent_id = coder_agent.main.id
   folder   = "/home/coder/project"
   default  = ["IU", "PY"]

registry/coder/modules/jetbrains/main.tf

@@ -125,7 +125,7 @@ variable "download_base_link" {
 }
 
 data "http" "jetbrains_ide_versions" {
-  for_each = length(var.default) == 0 ? var.options : var.default
+  for_each = local.selected_ides
   url      = "${var.releases_base_link}/products/releases?code=${each.key}&type=${var.channel}${var.major_version == "latest" ? "&latest=true" : ""}"
 }
 
@@ -174,9 +174,14 @@ variable "ide_config" {
 }
 
 locals {
+  # Determine the user's actual IDE selection.
+  # This is computed before the HTTP data source so that version lookups
+  # are only performed for IDEs the user chose — not every option.
+  selected_ides = length(var.default) == 0 ? toset(jsondecode(coalesce(data.coder_parameter.jetbrains_ides[0].value, "[]"))) : toset(var.default)
+
   # Parse HTTP responses once with error handling for air-gapped environments
   parsed_responses = {
-    for code in length(var.default) == 0 ? var.options : var.default : code => try(
+    for code in local.selected_ides : code => try(
       jsondecode(data.http.jetbrains_ide_versions[code].response_body),
       {} # Return empty object if API call fails
     )
@@ -184,7 +189,7 @@ locals {
 
   # Filter the parsed response for the requested major version if not "latest"
   filtered_releases = {
-    for code in length(var.default) == 0 ? var.options : var.default : code => [
+    for code in local.selected_ides : code => [
       for r in try(local.parsed_responses[code][keys(local.parsed_responses[code])[0]], []) :
       r if var.major_version == "latest" || r.majorVersion == var.major_version
     ]
@@ -192,13 +197,13 @@ locals {
 
   # Select the latest release for the requested major version (first item in the filtered list)
   selected_releases = {
-    for code in length(var.default) == 0 ? var.options : var.default : code =>
+    for code in local.selected_ides : code =>
     length(local.filtered_releases[code]) > 0 ? local.filtered_releases[code][0] : null
   }
 
-  # Dynamically generate IDE configurations based on options with fallback to ide_config
+  # Dynamically generate IDE configurations based on selected IDEs with fallback to ide_config
   options_metadata = {
-    for code in length(var.default) == 0 ? var.options : var.default : code => {
+    for code in local.selected_ides : code => {
       icon       = var.ide_config[code].icon
       name       = var.ide_config[code].name
       identifier = code
@@ -211,9 +216,6 @@ locals {
       json_data = local.selected_releases[code]
     }
   }
-
-  # Convert the parameter value to a set for for_each
-  selected_ides = length(var.default) == 0 ? toset(jsondecode(coalesce(data.coder_parameter.jetbrains_ides[0].value, "[]"))) : toset(var.default)
 }
 
 data "coder_parameter" "jetbrains_ides" {