Added new recipe to justfile

- upload-image recipe added to upload built images
- Added .env file to hold Linode API token
- Update .gitignore file to ignore local changes of .env

.env

@@ -0,0 +1 @@
+API_TOKEN=

.gitignore

@@ -1 +1,2 @@
 result
+.env

justfile

@@ -1,5 +1,21 @@
+set dotenv-required
 set quiet := true
 
+UPLOAD_URL := ```
+		curl -s -X POST \
+			--url https://api.linode.com/v4/images/upload \
+			--header 'accept: application/json' \
+			--header "authorization: Bearer $API_TOKEN" \
+			--header 'content-type: application/json' \
+			--data '
+				{
+					"description": "nixos",
+					"label": "nixos",
+					"region": "us-iad"
+				}
+			' | jq .upload_to
+	```
+
 [private]
 _default:
 	just --list
@@ -8,7 +24,18 @@ _default:
 _clean:
 	rm -f result
 
+[private]
+_image_exists:
+	[ -f result/linode-image.img.gz ] \
+		|| echo "Linode image not found."
+
 [doc('Builds Linode compatible NixOS disk image.')]
 build-image: _clean
 	nix build ".#nixosConfigurations.linode-image.config.system.build.raw"
 
+[doc('Uploads NixOS compatible disk image to Linode.')]
+upload-image: _image_exists
+	curl -X PUT \
+		--url {{UPLOAD_URL}} \
+		-T result/linode-image.img.gz
+