MDBF-819 - debian 11 arm builder in protected branches

we need an arm builder for all supported MariaDB Server versions in Protected Branches

constants.py

@@ -24,6 +24,7 @@
 # Defines what builders report status to GitHub
 github_status_builders = [
     "aarch64-macos-compile-only",
+    "aarch64-debian-11",
     "amd64-debian-12",
     "amd64-debian-12-debug-embedded",
     "amd64-debian-12-deb-autobake",

master-protected-branches/master.cfg

@@ -244,6 +244,18 @@ for w_name in ["hz-bbw"]:
             save_packages=False,
         )
 
+for w_name in ["aarch64-bbw"]:
+    jobs = 7
+    for i in [6, 7]:
+        addWorker(
+            w_name,
+            i,
+            "-debian-11",
+            os.getenv("CONTAINER_REGISTRY_URL", default="quay.io/mariadb-foundation/bb-worker:") + "debian11",
+            jobs=jobs,
+            save_packages=True,
+        )
+
 ####### FACTORY CODE
 
 ## f_tarball - create source tarball
@@ -539,6 +551,20 @@ c["builders"].append(
     )
 )
 
+c["builders"].append(
+    util.BuilderConfig(
+        name="aarch64-debian-11",
+        workernames=workers["aarch64-bbw-docker-debian-11"],
+        tags=["Debian", "quick", "gcc", "protected"],
+        collapseRequests=True,
+        nextBuild=nextBuild,
+        canStartBuild=canStartBuild,
+        locks=getLocks,
+        properties={"mtr_additional_args": protected_branches_mtr_additional_args},
+        factory=getQuickBuildFactory("nm", mtrDbPool),
+    )
+)
+
 c["builders"].append(
     util.BuilderConfig(
         name="amd64-fedora-40",