Disable third party builds (on push to main) until we migrate to self…

…-hosted runners (#38)

We're hitting `no space left on device` errors during llvm and stablehlo
builds with the free GitHub hosted runners, which come with limited disk
space allocations. Cleaning up the runners as recommended
[here](https://github.com/orgs/community/discussions/25678),
[here](https://github.com/orgs/community/discussions/26351) and
actions/runner-images#2875 have helped
partially (increase root mount from 20G to 47G) but it still isn't
enough for some builds. Temporarily disable the 3p builds on push to
main (they will still run as non-merge gating on PRs), and re-enable
once self-hosted runners are setup.

.github/workflows/bazelBuildAndTestLlvm.yml

@@ -13,12 +13,13 @@ on:
     paths:
       - 'deps.bzl'
       - '.github/workflows/bazelBuildAndTestLlvm.yml'
-  push:
-    branches:
-      - main
-    paths:
-      - 'deps.bzl'
-      - '.github/workflows/bazelBuildAndTestLlvm.yml'
+  # TODO: Use self-hosted runners as we hit disk space issues with GitHub hosted runners
+  # push:
+  #   branches:
+  #     - main
+  #   paths:
+  #     - 'deps.bzl'
+  #     - '.github/workflows/bazelBuildAndTestLlvm.yml'
   workflow_dispatch:
 
 # Ensure that only a single job or workflow using the same

.github/workflows/bazelBuildAndTestStablehlo.yml

@@ -13,12 +13,13 @@ on:
     paths:
       - 'deps.bzl'
       - '.github/workflows/bazelBuildAndTestStablehlo.yml'
-  push:
-    branches:
-      - main
-    paths:
-      - 'deps.bzl'
-      - '.github/workflows/bazelBuildAndTestStablehlo.yml'
+  # TODO: Use self-hosted runners as we hit disk space issues with GitHub hosted runners
+  # push:
+  #   branches:
+  #     - main
+  #   paths:
+  #     - 'deps.bzl'
+  #     - '.github/workflows/bazelBuildAndTestStablehlo.yml'
   workflow_dispatch:
 
 # Ensure that only a single job or workflow using the same

.github/workflows/bazelBuildAndTestTorchmlir.yml

@@ -13,12 +13,13 @@ on:
     paths:
       - 'deps.bzl'
       - '.github/workflows/bazelBuildAndTestTorchmlir.yml'
-  push:
-    branches:
-      - main
-    paths:
-      - 'deps.bzl'
-      - '.github/workflows/bazelBuildAndTestTorchmlir.yml'
+  # TODO: Use self-hosted runners as we hit disk space issues with GitHub hosted runners
+  # push:
+  #   branches:
+  #     - main
+  #   paths:
+  #     - 'deps.bzl'
+  #     - '.github/workflows/bazelBuildAndTestTorchmlir.yml'
   workflow_dispatch:
 
 # Ensure that only a single job or workflow using the same