Disable expensive and scheduled workflows on personal forks (#20449)

.github/workflows/deflake.yml

@@ -27,6 +27,7 @@ jobs:
   deflake_e2e_linux:
     name: 'E2E Test (Linux) - ${{ matrix.sandbox }}'
     runs-on: 'gemini-cli-ubuntu-16-core'
+    if: "github.repository == 'google-gemini/gemini-cli'"
     strategy:
       fail-fast: false
       matrix:
@@ -77,6 +78,7 @@ jobs:
   deflake_e2e_mac:
     name: 'E2E Test (macOS)'
     runs-on: 'macos-latest'
+    if: "github.repository == 'google-gemini/gemini-cli'"
     steps:
       - name: 'Checkout'
         uses: 'actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955' # ratchet:actions/checkout@v5
@@ -114,6 +116,7 @@ jobs:
   deflake_e2e_windows:
     name: 'Slow E2E - Win'
     runs-on: 'gemini-cli-windows-16-core'
+    if: "github.repository == 'google-gemini/gemini-cli'"
 
     steps:
       - name: 'Checkout'