ci: Add Debian 11 builds

The armv7l and ppc64le cross-builds as well as the Clang build
are adopted from Debian 10, while the mips64el build is adopted
from Debian sid. As always, the way jobs are distributed across
Debian versions is fairly arbitrary.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

ci/manifest.yml

@@ -28,9 +28,6 @@ targets:
     jobs:
       - arch: x86_64
 
-      - arch: x86_64
-        suffix: -clang
-
       - arch: aarch64
         allow-failure: true
         builds: false
@@ -38,6 +35,8 @@ targets:
       - arch: armv6l
 
       - arch: armv7l
+        allow-failure: true
+        builds: false
 
       - arch: i686
         allow-failure: true
@@ -51,6 +50,41 @@ targets:
 
       - arch: mipsel
 
+      - arch: ppc64le
+        allow-failure: true
+        builds: false
+
+      - arch: s390x
+        allow-failure: true
+        builds: false
+
+  debian-11:
+    jobs:
+      - arch: x86_64
+
+      - arch: x86_64
+        suffix: -clang
+
+      - arch: aarch64
+        allow-failure: true
+        builds: false
+
+      - arch: armv6l
+        allow-failure: true
+        builds: false
+
+      - arch: armv7l
+
+      - arch: i686
+        allow-failure: true
+        builds: false
+
+      - arch: mips64el
+
+      - arch: mipsel
+        allow-failure: true
+        builds: false
+
       - arch: ppc64le
 
       - arch: s390x
@@ -74,6 +108,8 @@ targets:
       - arch: i686
 
       - arch: mips64el
+        allow-failure: true
+        builds: false
 
       - arch: mipsel
         allow-failure: true