Modernizing many things

- use hashicorp/setup-terraform action
- bump terraform requirement to 0.13
- bump digitalocean provider requirement to 1.22
- bump to latest nvm
- remove a bunch of unnecessary quotes

.github/workflows/terraform.yml

@@ -1,23 +1,18 @@
 name: terraform
-on: [push, pull_request]
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
 jobs:
   terraform:
     name: Terraform
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
-    - name: fmt
-      uses: hashicorp/terraform-github-actions@master
+    - uses: actions/checkout@v2
+    - uses: hashicorp/setup-terraform@v1
       with:
-        tf_actions_version: 0.12.21
-        tf_actions_subcommand: fmt
-    - name: init
-      uses: hashicorp/terraform-github-actions@master
-      with:
-        tf_actions_version: 0.12.21
-        tf_actions_subcommand: init
-    - name: validate
-      uses: hashicorp/terraform-github-actions@master
-      with:
-        tf_actions_version: 0.12.21
-        tf_actions_subcommand: validate
+        terraform_version: 0.13.0
+    - run: terraform fmt -check -recursive
+    - run: terraform init
+    - run: terraform validate