BREAKING: replace custom build scripts with nix

General:
- Switched to yarn to better work with nix-based tooling
- Switched package system to use nix. This stops double dependencies and slow cloud compile times, while providing more compile/runtime support to the Nix project
- Removed container builder in favor of internal container tooling
- Package versions no-longer need to be SemVer compliant
- Removed "piston package spec" files, replaced with nix-flake based runtimes
- Exported nosocket and piston-api as packages within the nix-flake
- Removed repo container
- Switched docker building to nix-based container outputting
- Removed docker compose as this is a single container
- Removed package commands from CLI

Packages:
- Move bash, clojure, cobol, node, python2, python3 to new format
- Remainder of packages still need to be moved

v2 API:
- Removed "version" specifier. To select specific versions, use the v3 api
- Removed "/package" endpoints as this doesn't work with the new nix-based system

v3 API:
- Duplicate of v2 API, except instead of passing in a language name an ID is used intead.

api/package.json

@@ -1,20 +1,28 @@
 {
     "name": "piston-api",
-    "version": "3.1.0",
+    "version": "4.0.0",
     "description": "API for piston - a high performance code execution engine",
-    "main": "src/index.js",
+    "main": "src/pistond.js",
     "dependencies": {
         "body-parser": "^1.19.0",
-        "chownr": "^2.0.0",
         "express": "^4.17.1",
         "express-ws": "^5.0.2",
-        "is-docker": "^2.1.1",
         "logplease": "^1.2.15",
-        "nocamel": "HexF/nocamel#patch-1",
         "node-fetch": "^2.6.1",
-        "semver": "^7.3.4",
         "uuid": "^8.3.2",
-        "waitpid": "git+https://github.com/HexF/node-waitpid.git"
+        "nocamel": "git://github.com/HexF/nocamel.git#patch-1",
+        "waitpid": "git://github.com/HexF/node-waitpid.git"
     },
-    "license": "MIT"
+    "license": "MIT",
+    "scripts": {
+        "lint": "prettier . --write",
+        "prepack": "yarn2nix > yarn.nix"
+    },
+    "devDependencies": {
+        "node2nix": "^1.6.0",
+        "prettier": "2.2.1"
+    },
+    "bin": {
+        "pistond": "./src/pistond.js"
+    }
 }