build(fix): Bump TA steps memory from 4 to 6Gi (#2134)

Author: msugakov

.tekton/collector-build.yaml

@@ -71,9 +71,9 @@ spec:
       # use-/create-trusted-artifact gets OOM-killed when a cluster is loaded. Bigger mem limits==request should help.
       computeResources: &ta-resources
         limits:
-          memory: 4Gi
+          memory: 6Gi
         requests:
-          memory: 4Gi
+          memory: 6Gi
 
   - pipelineTaskName: clone-repository
     stepSpecs:
@@ -125,6 +125,10 @@ spec:
     stepSpecs:
     - name: use-trusted-artifact
       computeResources: *ta-resources
+  - pipelineTaskName: push-dockerfile
+    stepSpecs:
+    - name: use-trusted-artifact
+      computeResources: *ta-resources
 
   taskRunTemplate:
     serviceAccountName: build-pipeline-collector