ci: Add private mergebot script

Uses Azure instead of GitHub

.ci/scripts/merge/apply-patches-by-label-private.py

+# Download all pull requests as patches that match a specific label
+# Usage: python download-patches-by-label.py <Label to Match> <Root Path Folder to DL to>
+
+import requests, sys, json, urllib3.request, shutil, subprocess, os, traceback
+
+org = os.getenv("PrivateMergeOrg".upper(), "yuzu-emu")
+repo = os.getenv("PrivateMergeRepo".upper(), "yuzu-private")
+tagline = os.getenv("MergeTaglinePrivate".upper(), "")
+user = sys.argv[1]
+
+http = urllib3.PoolManager()
+dl_list = {}
+
+def check_individual(repo_id, pr_id):
+    url = 'https://%sdev.azure.com/%s/%s/_apis/git/repositories/%s/pullRequests/%s/labels?api-version=5.1-preview.1' % (user, org, repo, repo_id, pr_id)
+    response = requests.get(url)
+    if (response.ok):
+        j = json.loads(response.content)
+        for tg in j['value']:
+            if (tg['name'] == sys.argv[2]):
+                return True
+    return False
+
+try:
+    url = 'https://%sdev.azure.com/%s/%s/_apis/git/pullrequests?api-version=5.1' % (user, org, repo)
+    response = requests.get(url)
+    if (response.ok):
+        j = json.loads(response.content)
+        for pr in j["value"]:
+            repo_id = pr['repository']['id']
+            pr_id = pr['pullRequestId']
+            if (check_individual(repo_id, pr_id)):
+                pn = pr_id
+                ref  = pr['sourceRefName']
+                print("Matched PR# %s" % pn)
+                print(subprocess.check_output(["git", "fetch", "https://%sdev.azure.com/%s/_git/%s" % (user, org, repo), ref, "-f"]))
+                print(subprocess.check_output(["git", "merge", "--squash", 'origin/' + ref.replace('refs/heads/','')]))
+                print(subprocess.check_output(["git", "commit", "-m\"Merge %s PR %s\"" % (tagline, pn)]))
+except:
+    traceback.print_exc(file=sys.stdout)
+    sys.exit(-1)