Add Nix flake along with usage instructions

.editorconfig

@@ -2,14 +2,11 @@ root = true
 
 [*]
 charset = utf-8
-indent_style = space
-indent_size = 4
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
 
 [*.md]
-insert_final_newline = false
 trim_trailing_whitespace = false
 
 [*.go]
@@ -21,5 +18,5 @@ indent_size = 2
 [*.xml]
 indent_size = 2
 
-[Makefile]
+[{Makefile,.envrc}]
 indent_style = tab

.envrc

@@ -0,0 +1,4 @@
+if command -v nix &>/dev/null; then
+	use flake
+	PATH_add "$PWD/result/bin"
+fi

.gitignore

@@ -4,3 +4,6 @@
 vendor/
 bin/
 dist/
+
+/result
+/.pre-commit-config.yaml

README.md

@@ -24,7 +24,9 @@ All files are located inside Jenkins home directory:
 
 I've tested this on Jenkins 1.625.1 and 2.141
 
-### Run using a binary
+## Usage
+
+### Pre-Built Binary
 
 Mac (Intel CPU only):
 
@@ -61,7 +63,7 @@ Or if you have the files locally:
       -c credentials.xml \
       -o json
       
-### Run using docker
+### Docker
 
 If you are worried about the binary sending your credentials over the network (it does not do that) 
 then run a container with disabled network:
@@ -97,8 +99,15 @@ With files locally:
         -s hudson.util.Secret \
         -c credentials.xml \
         -o json
-        
-### Build the binary yourself
+
+### Nix
+
+Assuming you have enabled [Flakes](https://nixos.wiki/wiki/Flakes) in your Nix configuration, you can use the provided [`flake.nix`](./flake.nix) to build and run this project.
+
+- To build and run the binary without installing it: `nix run github:hoto/jenkins-credentials-decryptor -- --help`
+- To install in the current profile: `nix profile install github:hoto/jenkins-credentials-decryptor`
+
+### Build Locally
 
 If you are worried about executing a random binary from the internet then: