Make OTP installation optional (#81)

test-projects/gleam_gleam/.github/workflows/test.yml

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+name: test
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.0.0
+      - uses: erlef/setup-beam@v1.9.0
+        with:
+          otp-version: "23.2"
+          gleam-version: "0.19.0-rc3"
+      - run: gleam format --check src test
+      - run: gleam deps download
+      - run: gleam test

test-projects/gleam_gleam/.gitignore

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+*.beam
+*.ez
+build
+erl_crash.dump

test-projects/gleam_gleam/README.md

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+# gleam_gleam
+
+A Gleam project
+
+## Quick start
+
+```sh
+gleam run   # Run the project
+gleam test  # Run the tests
+gleam shell # Run an Erlang shell
+```
+
+## Installation
+
+If available on Hex this package can be added to your Gleam project.
+
+```sh
+gleam add gleam_gleam
+```

test-projects/gleam_gleam/gleam.toml

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+name = "gleam_gleam"
+version = "0.1.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# licences = ["Apache-2.0"]
+# description = "A Gleam library..."
+# repository = { type = "github", user = "username", repo = "project" }
+# links = [{ title = "Website", href = "https://gleam.run" }]
+
+[dependencies]
+gleam_stdlib = "~> 0.18"
+
+[dev-dependencies]
+gleeunit = "~> 0.5"

test-projects/gleam_gleam/manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_stdlib", version = "0.19.2", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "FFA79EA12369F122B68885E694E097D6810402A2F86BFF48AAE9E40ACE654F4C" },
+  { name = "gleeunit", version = "0.6.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "77701A5E5A565727E1EEAC9196FB878D544049B6331CD0305B5A69699135EA1C" },
+]
+
+[requirements]
+gleam_stdlib = "~> 0.18"
+gleeunit = "~> 0.5"

test-projects/gleam_gleam/src/gleam_gleam.gleam

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+import gleam/io
+
+pub fn main() {
+  io.println("Hello from gleam_gleam!")
+}

test-projects/gleam_gleam/test/gleam_gleam_test.gleam

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+import gleeunit
+import gleeunit/should
+
+pub fn main() {
+  gleeunit.main()
+}
+
+// gleeunit test functions end in `_test`
+pub fn hello_world_test() {
+  1
+  |> should.equal(1)
+}