Update to self-hosted runners for Actions Deployment (github#22440)

* update to self-hosted runners

* remove zstd temporarily

Author: gracepark

.github/workflows/staging-build-pr.yml

@@ -30,7 +30,7 @@ jobs:
 
   build-pr:
     if: ${{ github.repository == 'github/docs-internal' || github.repository == 'github/docs' }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ fromJSON('["ubuntu-latest", "self-hosted"]')[github.repository == 'github/docs-internal'] }}
     timeout-minutes: 5
     # This interrupts Build, Deploy, and pre-write Undeploy workflow runs in
     # progress for this PR branch.

.github/workflows/staging-deploy-pr.yml

@@ -251,7 +251,7 @@ jobs:
   prepare-for-deploy:
     needs: [pr-metadata, check-pr-before-prepare]
     if: ${{ needs.check-pr-before-prepare.outputs.pull_request_state == 'open' }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ fromJSON('["ubuntu-latest", "self-hosted"]')[github.repository == 'github/docs-internal'] }}
     timeout-minutes: 5
     # This interrupts Build, Deploy, and pre-write Undeploy workflow runs in
     # progress for this PR branch.
@@ -446,7 +446,7 @@ jobs:
   deploy:
     needs: [pr-metadata, prepare-for-deploy, check-pr-before-deploy]
     if: ${{ needs.check-pr-before-deploy.outputs.pull_request_state == 'open' }}
-    runs-on: ubuntu-latest
+    runs-on: ${{ fromJSON('["ubuntu-latest", "self-hosted"]')[github.repository == 'github/docs-internal'] }}
     timeout-minutes: 10
     # This interrupts Build, Deploy, and pre-write Undeploy workflow runs in
     # progress for this PR branch.