Change things up with Crowdin and release-related workflows (#4833)

* Alternative way of doing Crowdin...

* Limit the upload translations workflow to V3/develop

* Make the workflow close and reopen the PR automatically while I'm at it

* Add a workflow for preparing PRs for release

* Make the crowdin env vars local to the step requiring them

* Move dev bump to Publish Release workflow

.github/workflows/scripts/bump_version.py

@@ -0,0 +1,45 @@
+import os
+import re
+import sys
+from typing import Match
+
+import redbot
+
+
+version_info = None
+
+
+def repl(match: Match[str]) -> str:
+    global version_info
+
+    new_stable_version = os.environ.get("NEW_STABLE_VERSION", "auto")
+    if new_stable_version == "auto":
+        version_info = redbot.VersionInfo.from_str(match.group("version"))
+        version_info.dev_release = None
+    else:
+        version_info = redbot.VersionInfo.from_str(new_stable_version)
+
+    if int(os.environ.get("DEV_BUMP", 0)):
+        version_info.micro += 1
+        version_info.dev_release = 1
+
+    return f'__version__ = "{version_info}"'
+
+
+with open("redbot/__init__.py", encoding="utf-8") as fp:
+    new_contents, found = re.subn(
+        pattern=r'^__version__ = "(?P<version>[^"]*)"$',
+        repl=repl,
+        string=fp.read(),
+        count=1,
+        flags=re.MULTILINE,
+    )
+
+if not found:
+    print("Couldn't find `__version__` line!")
+    sys.exit(1)
+
+with open("redbot/__init__.py", "w", encoding="utf-8", newline="\n") as fp:
+    fp.write(new_contents)
+
+print(f"::set-output name=new_version::{version_info}")

.github/workflows/scripts/close_and_reopen_pr.js

@@ -0,0 +1,25 @@
+module.exports = (async function ({github, context}) {
+    const pr_number = process.env.PR_NUMBER;
+    const pr_operation = process.env.PR_OPERATION;
+    let sleep_time = 0;
+
+    if (!['created', 'updated'].includes(pr_operation)) {
+        console.log('PR was not created as there were no changes.')
+        return;
+    }
+
+    for (const new_state of ['closed', 'open']) {
+        // some sleep time needed to make sure API handles open after close
+        if (sleep_time)
+            await new Promise(r => setTimeout(r, sleep_time));
+
+        github.issues.update({
+            issue_number: pr_number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            state: new_state
+        });
+
+        sleep_time = 2000;
+    }
+})