Add a welcome comment to first time contributor PR (#28118)

* Add a welcome comment to first time contributor PR

This PR seeks to close out this project automation task by adding in a welcome message to first time contributors encouraging them to join WordPress.org slack and to review the core handbook: #27423 Rather than creating a new file, decided to just latch onto our current setup for adding the first time contributor label. 

I'm no JS developer so, in a true inception moment, I'll need some "first time contributor" like guidance here to get this right 😄 and, per usual, welcome thoughts on what this message should say. Since we already have a message in place when a PR is merged to encourage folks to connect their WordPress.org profile, I'm leaving that out.

* Fix a missed quotation mark

Co-authored-by: Daniel Richards <daniel.richards@automattic.com>

* Update packages/project-management-automation/lib/tasks/first-time-contributor-label/index.js

Co-authored-by: Daniel Richards <daniel.richards@automattic.com>

* Make the code prettier

* Update test to take into account new comment feature

Co-authored-by: Daniel Richards <daniel.richards@automattic.com>

packages/project-management-automation/lib/tasks/first-time-contributor-label/index.js

@@ -46,6 +46,22 @@ async function firstTimeContributorLabel( payload, octokit ) {
 		issue_number: payload.pull_request.number,
 		labels: [ 'First-time Contributor' ],
 	} );
+
+	/**
+	 * Adds a welcome comment to the first time PR
+	 */
+
+	await octokit.issues.createComment( {
+		owner,
+		repo,
+		issue_number: payload.pull_request.number,
+		body:
+			':wave: Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @' +
+			author +
+			"!. In case you missed it, we'd love to have you join us in our [Slack community](https://make.wordpress.org/chat/)," +
+			'where we hold [regularly weekly meetings](https://make.wordpress.org/core/tag/core-editor-summary/) open to anyone to coordinate with each other.\n\n' +
+			'If you want to learn more about WordPress development in general, check out the [Core Handbook](https://make.wordpress.org/core/handbook/) full of helpful information.',
+	} );
 }
 
 module.exports = firstTimeContributorLabel;

packages/project-management-automation/lib/tasks/first-time-contributor-label/test/index.js

@@ -32,6 +32,7 @@ describe( 'firstTimeContributorLabel', () => {
 			},
 			issues: {
 				addLabels: jest.fn(),
+				createComment: jest.fn(),
 			},
 		};
 
@@ -43,6 +44,7 @@ describe( 'firstTimeContributorLabel', () => {
 			author: 'ghost',
 		} );
 		expect( octokit.issues.addLabels ).not.toHaveBeenCalled();
+		expect( octokit.issues.createComment ).not.toHaveBeenCalled();
 	} );
 
 	it( 'adds the First Time Contributor label if the user has no commits', async () => {
@@ -56,9 +58,16 @@ describe( 'firstTimeContributorLabel', () => {
 			},
 			issues: {
 				addLabels: jest.fn(),
+				createComment: jest.fn(),
 			},
 		};
 
+		const expectedComment =
+			':wave: Thanks for your first Pull Request and for helping build the future of Gutenberg and WordPress, @ghost' +
+			"!. In case you missed it, we'd love to have you join us in our [Slack community](https://make.wordpress.org/chat/)," +
+			'where we hold [regularly weekly meetings](https://make.wordpress.org/core/tag/core-editor-summary/) open to anyone to coordinate with each other.\n\n' +
+			'If you want to learn more about WordPress development in general, check out the [Core Handbook](https://make.wordpress.org/core/handbook/) full of helpful information.';
+
 		await firstTimeContributorLabel( payload, octokit );
 
 		expect( octokit.repos.listCommits ).toHaveBeenCalledWith( {
@@ -72,5 +81,11 @@ describe( 'firstTimeContributorLabel', () => {
 			issue_number: 123,
 			labels: [ 'First-time Contributor' ],
 		} );
+		expect( octokit.issues.createComment ).toHaveBeenCalledWith( {
+			owner: 'WordPress',
+			repo: 'gutenberg',
+			issue_number: 123,
+			body: expectedComment,
+		} );
 	} );
 } );