Minimize builds

Author: jonashaag

.github/workflows/ubuntu.yml

@@ -27,8 +27,10 @@ jobs:
     timeout-minutes: 180
     strategy:
       matrix:
-        env_file: [actions-38.yaml, actions-39.yaml, actions-310.yaml]
-        pattern: ["not single_cpu", "single_cpu"]
+        #env_file: [actions-38.yaml, actions-39.yaml, actions-310.yaml]
+        env_file: [actions-310.yaml]
+          #pattern: ["not single_cpu", "single_cpu"]
+        pattern: ["not single_cpu"]
         pyarrow_version: ["10"]
           #pyarrow_version: ["7", "8", "9", "10"]
           #include: