fix(ci): Add SCCACHE_CACHE_KEY_PREFIX derived from Cargo.lock hash to Rust CI workflows (#62609)

Co-authored-by: mendral-app[bot] <233154221+mendral-app[bot]@users.noreply.github.com>
Co-authored-by: Georges-Antoine Assi <3247106+gantoine@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: 3 people

.github/workflows/_rust-build-images.yml

@@ -141,6 +141,7 @@ jobs:
                   echo "endpoint=$SCCACHE_WEBDAV_ENDPOINT" >> "$GITHUB_OUTPUT"
                   echo "::add-mask::$SCCACHE_WEBDAV_TOKEN"
                   echo "token=$SCCACHE_WEBDAV_TOKEN" >> "$GITHUB_OUTPUT"
+                  echo "cache-key-prefix=cargo-${{ hashFiles('rust/Cargo.lock') }}" >> "$GITHUB_OUTPUT"
 
             - name: Build and push image
               id: docker_build
@@ -159,6 +160,7 @@ jobs:
                       SCCACHE_NO_DAEMON=1
                       BIN=${{ matrix.bin || matrix.image }}
                       BUILD_FEATURES=${{ matrix.features || '' }}
+                      SCCACHE_WEBDAV_KEY_PREFIX=${{ steps.sccache.outputs.cache-key-prefix }}
                   secrets: |
                       SCCACHE_WEBDAV_ENDPOINT=${{ steps.sccache.outputs.endpoint }}
                       SCCACHE_WEBDAV_TOKEN=${{ steps.sccache.outputs.token }}

.github/workflows/ci-rust.yml

@@ -252,6 +252,9 @@ jobs:
               with:
                   toolchain: 1.91.1
 
+            - name: Set sccache WebDAV key prefix (Cargo.lock hash)
+              run: echo "SCCACHE_WEBDAV_KEY_PREFIX=cargo-${{ hashFiles('rust/Cargo.lock') }}" >> "$GITHUB_ENV"
+
             - name: Install sccache
               uses: ./.github/actions/setup-sccache
 
@@ -338,6 +341,9 @@ jobs:
             - name: Install protoc
               uses: ./.github/actions/setup-protoc
 
+            - name: Set sccache WebDAV key prefix (Cargo.lock hash)
+              run: echo "SCCACHE_WEBDAV_KEY_PREFIX=cargo-${{ hashFiles('rust/Cargo.lock') }}" >> "$GITHUB_ENV"
+
             - name: Install sccache
               uses: ./.github/actions/setup-sccache
 
@@ -449,6 +455,9 @@ jobs:
                   toolchain: 1.91.1
                   components: clippy,rustfmt
 
+            - name: Set sccache WebDAV key prefix (Cargo.lock hash)
+              run: echo "SCCACHE_WEBDAV_KEY_PREFIX=cargo-${{ hashFiles('rust/Cargo.lock') }}" >> "$GITHUB_ENV"
+
             - name: Install sccache
               uses: ./.github/actions/setup-sccache
 

rust/Dockerfile

@@ -17,7 +17,8 @@ FROM base AS builder
 WORKDIR /app
 ARG BIN
 ARG BUILD_FEATURES=""
-ENV PROTO_ROOT=../proto
+ARG SCCACHE_WEBDAV_KEY_PREFIX
+ENV PROTO_ROOT=../proto SCCACHE_WEBDAV_KEY_PREFIX=${SCCACHE_WEBDAV_KEY_PREFIX}
 
 # Ensure working C compile setup (not installed by default in arm64 images)
 # libclang-dev is required for bindgen (used by librocksdb-sys)