fix(ci): replace wasm32v1-none with WASM_BUILD_STD=0 in all build jobs

wasm32v1-none pre-built sysroot lacks std, causing memchr compilation
failure. Instead, disable build-std via WASM_BUILD_STD=0 and let
wasm-builder use the pre-built wasm32-unknown-unknown sysroot which
includes std.

Affected: 11 build jobs in build-publish-images.yml, 2 benchmark jobs
in check-pezframe-omni-bencher.yml.

.github/workflows/check-pezframe-omni-bencher.yml

@@ -26,6 +26,7 @@ jobs:
       RUST_BACKTRACE: "full"
       WASM_BUILD_NO_COLOR: 1
       WASM_BUILD_RUSTFLAGS: "-C debug-assertions"
+      WASM_BUILD_STD: "0"
       RUST_LOG: "frame_omni_bencher=info,pezkuwi_sdk_frame=info"
     timeout-minutes: 60
     container:
@@ -34,9 +35,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
-      - name: Install wasm32v1-none target
-        run: rustup target add wasm32v1-none
-
       - name: Clean cargo cache to free disk space
         run: |
           cargo clean 2>/dev/null || true
@@ -85,13 +83,11 @@ jobs:
       PACKAGE_NAME: ${{ matrix.runtime.package }}
       FLAGS: ${{ matrix.runtime.bench_flags }}
       RUST_LOG: "frame_omni_bencher=info,pezkuwi_sdk_frame=info"
+      WASM_BUILD_STD: "0"
     steps:
       - name: Checkout
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
-      - name: Install wasm32v1-none target
-        run: rustup target add wasm32v1-none
-
       - name: script (benchmark ${{ matrix.bench_cmd }})
         id: required
         shell: bash