add devcontainer setup

Author: lechnerc77

.devcontainer/default/devcontainer.json

@@ -0,0 +1,29 @@
+{
+	"name": "Terraform Admin Guide Samples - Default",
+	"image": "mcr.microsoft.com/devcontainers/base:debian",
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers/features/terraform:1": {},
+		"ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/robbert229/devcontainer-features/opentofu:1": {
+			"version": "1.9.0"
+		}
+	},
+	"customizations": {
+		"vscode": {
+			"settings": {},
+			"extensions": [
+				"HashiCorp.terraform",
+				"Github.copilot",
+        "gamunu.opentofu"
+			]
+		},
+		"codespaces": {}
+	},
+	"hostRequirements": {
+		"memory": "4gb"
+	},
+	// If you want to use SSO please install xdg-utils in the container
+	//"postCreateCommand": "bash ./.devcontainer/scripts/install-xdg.sh",
+	"remoteUser": "vscode"
+}

.devcontainer/withenvfile/devcontainer.json

@@ -0,0 +1,38 @@
+{
+	"name": "Terraform Admin Guide Samples - with env file",
+	"image": "mcr.microsoft.com/devcontainers/base:debian",
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers/features/terraform:1": {},
+		"ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/robbert229/devcontainer-features/opentofu:1": {
+			"version": "1.9.0"
+		}
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"Github.copilot",
+				"HashiCorp.terraform",
+        "gamunu.opentofu"
+			],
+			// Set *default* container specific settings.json values on container create.
+			"settings": {}
+		},
+		"codespaces": {}
+	},
+	"hostRequirements": {
+		"memory": "4gb"
+	},
+	// If you want to use SSO please install xdg-utils in the container
+	//"postCreateCommand": "bash ./.devcontainer/scripts/install-xdg.sh",
+	"remoteUser": "vscode",
+	// This devcontainer expects a file named .devcontainer/devcontainer.env to exist.
+	// you should place the following environment variables in that file:
+	// - BTP_USERNAME
+	// - BTP_PASSWORD
+	"runArgs": [
+		"--env-file",
+		".devcontainer/devcontainer.env"
+	]
+}