Remove on push triggers

.github/workflows/build-android-x86_64.yml

@@ -2,7 +2,6 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:

.github/workflows/build-deploy-android-arm32.yml

@@ -2,7 +2,6 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:

.github/workflows/build-deploy-android-arm64.yml

@@ -2,7 +2,6 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:

.github/workflows/build-deploy-linux-arm32.yml

@@ -2,7 +2,6 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:

.github/workflows/build-deploy-linux-arm64.yml

@@ -2,7 +2,6 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:

.github/workflows/build-deploy-linux-cuda-11.0.yml

@@ -2,11 +2,10 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-16.04
     timeout-minutes: 1
     steps:
       - name: 'Block Concurrent Executions'

.github/workflows/build-deploy-linux-cuda-11.2.yml

@@ -2,11 +2,10 @@ on:
   schedule:
     - cron: "0 */12 * * *"
   workflow_dispatch:
-  push:
 jobs:
   # Wait for up to a minute for previous run to complete, abort if not done by then
   pre-ci:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-16.04
     timeout-minutes: 1
     steps:
       - name: 'Block Concurrent Executions'