Fix the sccache startup flake (#28464)

Try to startup sccache 3 times.

GitOrigin-RevId: f0c8467747cc1f581106760dba35256ba0f9eccd

Author: nipunn1313

.github/actions/setup-rust/action.yml

@@ -41,11 +41,6 @@ runs:
           echo "SODIUM_USE_PKG_CONFIG=1" >> $GITHUB_ENV
           echo "ROCKSDB_LIB_DIR=/usr/lib" >> $GITHUB_ENV
         fi
-        echo "SCCACHE_ENDPOINT=https://a4aa0fffebef8bc497f64875c40ee6fb.r2.cloudflarestorage.com" >> $GITHUB_ENV
-        echo "SCCACHE_BUCKET=cvx-actions-cache" >> $GITHUB_ENV
-        echo "SCCACHE_REGION=auto" >> $GITHUB_ENV
-        echo "AWS_ACCESS_KEY_ID=${{ inputs.r2-access-key }}" >> $GITHUB_ENV
-        echo "AWS_SECRET_ACCESS_KEY=${{ inputs.r2-secret-key }}" >> $GITHUB_ENV
         echo "CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse" >> $GITHUB_ENV
         echo "CARGO_NET_GIT_FETCH_WITH_CLI=true" >> $GITHUB_ENV
 
@@ -54,6 +49,18 @@ runs:
       with:
         version: "v0.8.0"
 
+    - name: Start sccache
+      shell: bash
+      env:
+        SCCACHE_ENDPOINT: https://a4aa0fffebef8bc497f64875c40ee6fb.r2.cloudflarestorage.com
+        SCCACHE_BUCKET: cvx-actions-cache
+        SCCACHE_REGION: auto
+        AWS_ACCESS_KEY_ID: ${{ inputs.r2-access-key }}
+        AWS_SECRET_ACCESS_KEY: ${{ inputs.r2-secret-key }}
+      run: |
+        # Try to start sccache up to 3 times. Sometimes it times out for unknown reasons.
+        (r=3;while ! sccache --start-server ; do ((--r))||exit;sleep 5;done)
+
     # n.b. this action inspects the environment and variables starting with
     # `CARGO_` are used as part of the cache key.
     # If users of this composite action add additional `CARGO_*` variables after

.github/workflows/build_local_backend.yml

@@ -35,8 +35,6 @@ jobs:
         uses: runs-on/cache@v4
         env:
           AWS_REGION: ${{ vars.AWS_REGION }}
-          AWS_ACCESS_KEY_ID: ""
-          AWS_SECRET_ACCESS_KEY: ""
           RUNS_ON_S3_BUCKET_CACHE: ${{ vars.RUNS_ON_S3_BUCKET_CACHE }}
         with:
           path: |

.github/workflows/precompile.yml

@@ -40,8 +40,6 @@ jobs:
         uses: runs-on/cache@v4
         env:
           AWS_REGION: ${{ vars.AWS_REGION }}
-          AWS_ACCESS_KEY_ID: ""
-          AWS_SECRET_ACCESS_KEY: ""
           RUNS_ON_S3_BUCKET_CACHE: ${{ vars.RUNS_ON_S3_BUCKET_CACHE }}
         with:
           path: |