Cirrus: Run vendor check in parallel

This task is heavily network bound, and takes way too long to include
along with the gating task.  Separate it out and run it in parallel
to everything else.  Also add some reasonable timeouts.

Signed-off-by: Chris Evich <cevich@redhat.com>

.cirrus.yml

@@ -118,20 +118,13 @@ gating_task:
         cpu: 4
         memory: 12
 
+    timeout_in: 20m
+
     gate_script:
         - '/usr/local/bin/entrypoint.sh validate'
         - '/usr/local/bin/entrypoint.sh lint'
         - '${CIRRUS_WORKING_DIR}/${SCRIPT_BASE}/test/test_dot_cirrus_yaml.py'
 
-    # This task runs `make vendor` followed by ./hack/tree_status.sh to check
-    # whether the git tree is clean.  The reasoning for that is to make sure
-    # that the vendor.conf, the code and the vendored packages in ./vendor are
-    # in sync at all times.
-    vendor_script:
-        - '/usr/local/bin/entrypoint.sh .install.vndr'
-        - '/usr/local/bin/entrypoint.sh vendor'
-        - 'cd /go/src/github.com/containers/libpod && ./hack/tree_status.sh'
-
     # This task builds Podman with different buildtags to ensure the build does
     # not break.
     build_script:
@@ -144,6 +137,35 @@ gating_task:
         master_script: '$CIRRUS_WORKING_DIR/$SCRIPT_BASE/notice_master_failure.sh'
 
 
+# This task runs `make vendor` followed by ./hack/tree_status.sh to check
+# whether the git tree is clean.  The reasoning for that is to make sure
+# that the vendor.conf, the code and the vendored packages in ./vendor are
+# in sync at all times.
+vendor_task:
+
+    depends_on:
+        - "gating"
+
+    env:
+        CIRRUS_WORKING_DIR: "/usr/src/libpod"
+
+    # Runs within Cirrus's "community cluster"
+    container:
+        image: "quay.io/libpod/gate:latest"
+        cpu: 4
+        memory: 12
+
+    timeout_in: 30m
+
+    vendor_script:
+        - '/usr/local/bin/entrypoint.sh .install.vndr'
+        - '/usr/local/bin/entrypoint.sh vendor'
+        - 'cd /go/src/github.com/containers/libpod && ./hack/tree_status.sh'
+
+    on_failure:
+        master_script: '$CIRRUS_WORKING_DIR/$SCRIPT_BASE/notice_master_failure.sh'
+
+
 build_each_commit_task:
 
     depends_on: