feat: github-auth flag (#4926)

* feat: github-auth flag

This will allow injecting credentials into code-server if you already
have them.

* Update Code

Contains the GitHub auth changes.

* Add e2e test for GitHub token

test/unit/node/cli.test.ts

@@ -313,6 +313,19 @@ describe("parser", () => {
     })
   })
 
+  it("should use env var github token", async () => {
+    process.env.GITHUB_TOKEN = "ga-foo"
+    const args = parse([])
+    expect(args).toEqual({})
+
+    const defaultArgs = await setDefaults(args)
+    expect(defaultArgs).toEqual({
+      ...defaults,
+      "github-auth": "ga-foo",
+    })
+    expect(process.env.GITHUB_TOKEN).toBe(undefined)
+  })
+
   it("should error if password passed in", () => {
     expect(() => parse(["--password", "supersecret123"])).toThrowError(
       "--password can only be set in the config file or passed in via $PASSWORD",
@@ -325,6 +338,12 @@ describe("parser", () => {
     )
   })
 
+  it("should error if github-auth passed in", () => {
+    expect(() => parse(["--github-auth", "fdas423fs8a"])).toThrowError(
+      "--github-auth can only be set in the config file or passed in via $GITHUB_TOKEN",
+    )
+  })
+
   it("should filter proxy domains", async () => {
     const args = parse(["--proxy-domain", "*.coder.com", "--proxy-domain", "coder.com", "--proxy-domain", "coder.org"])
     expect(args).toEqual({
@@ -374,6 +393,11 @@ describe("parser", () => {
   it("should ignore optional strings set to false", async () => {
     expect(parse(["--cert=false"])).toEqual({})
   })
+  it("should use last flag", async () => {
+    expect(parse(["--port", "8081", "--port", "8082"])).toEqual({
+      port: 8082,
+    })
+  })
 })
 
 describe("cli", () => {