dev: fix all devcontainer issues

Author: sgtoj

.devcontainer/devcontainer.json

@@ -4,6 +4,9 @@
   "features": {
     "ghcr.io/devcontainers/features/docker-in-docker:2.0.1": {},
   },
+  "containerEnv": {
+    "TF_PLUGIN_CACHE_DIR": "/workspaces/terraform-aws-cognito-custom-message-sender/.devcontainer/tmp/.terraform.d/"
+  },
   "customizations": {
     "vscode": {
       "settings": {

.devcontainer/tmp/.terraform.d/.gitkeep

@@ -1,11 +1,15 @@
 # .gitignore
 
 # terraform files
+.terraform.lock.hcl
+.terraform.tfstate.lock.info
+*.tfvars.hcl
 *.tfstate
 *.tfstate.*.backup
 *.tfstate.backup
 *.tfplan
 *.terraform/
+*.tfvars
 .grunt
 
 # node.js / typescript
@@ -38,7 +42,8 @@ lib-cov
 dockerfile.*.bak
 
 # general
-tmp
+tmp/
+!**/.gitkeep
 .DS_Store
 .env
 .env.local