Add some scripts

See RFC https://github.com/PostHog/meta/pull/309/files for some context on these scripts.

Author: haacked

README.md

@@ -137,6 +137,8 @@ Posthog.feature_flags("user_123",
 
 ## Local Development
 
+Run `bin/setup` to install development dependencies or run the following commands manually:
+
 We recommend using `asdf` to manage Elixir and Erlang versions:
 
 ```sh
@@ -148,6 +150,14 @@ mix deps.get
 mix compile
 ```
 
+Run tests:
+
+```sh
+bin/test
+```
+
+(This runs `mix test`).
+
 ### Troubleshooting
 
 If you encounter WX library issues during Erlang installation:

bin/helpers/_utils.sh

@@ -0,0 +1,15 @@
+error() {
+    echo "$@" >&2
+}
+
+fatal() {
+    error "$@"
+    exit 1
+}
+
+set_source_and_root_dir() {
+    { set +x; } 2>/dev/null
+    source_dir="$( cd -P "$( dirname "$0" )" >/dev/null 2>&1 && pwd )"
+    root_dir=$(cd $source_dir && cd ../ && pwd)
+    cd $root_dir
+}

bin/setup

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+#/ Usage: bin/test [<configuration>]
+#/ Description: Runs all the tests for the target frameworks: netstandard2.1 and net8.0
+source bin/helpers/_utils.sh
+set_source_and_root_dir
+
+if ! command -v asdf &> /dev/null; then
+    brew install asdf
+fi
+
+asdf plugin add erlang
+asdf plugin add elixir
+asdf install
+
+mix deps.get
+mix compile

bin/test

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+#/ Usage: bin/test [<configuration>]
+#/ Description: Runs all the tests for the target frameworks: netstandard2.1 and net8.0
+source bin/helpers/_utils.sh
+set_source_and_root_dir
+
+mix test