ci: sync from upstream, and deduplicate jobs when

push to `main`, and remove always failing job `codecov`.

.github/workflows/ci.yml

@@ -1,14 +1,25 @@
 name: CI checks
 
-on: [pull_request, push]
+on:
+  merge_group:
+  pull_request:
+  push:
+    branches:
+      - main
 
 jobs:
   test:
-    name: Test on ${{ matrix.os }}
+    name: Test on ${{ matrix.os }} with ${{ matrix.feature_set }} features
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        feature_set: [basic, all]
         os: [ubuntu-latest, windows-latest, macOS-latest]
+        include:
+          - feature_set: basic
+            features: batch,dev-graph,gadget-traces
+          - feature_set: all
+            features: batch,dev-graph,gadget-traces,multicore,test-dev-graph,thread-safe-region,sanity-checks,circuit-params
 
     steps:
       - uses: actions/checkout@v3
@@ -19,7 +30,67 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: test
-          args: --verbose --release --all --all-features
+          args: --verbose --release --workspace --no-default-features --features "${{ matrix.features }}"
+
+  build:
+    name: Build target ${{ matrix.target }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target:
+          - wasm32-unknown-unknown
+          - wasm32-wasi
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          override: false
+      - name: Add target
+        run: rustup target add ${{ matrix.target }}
+      - name: cargo build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --no-default-features --features batch,dev-graph,gadget-traces --target ${{ matrix.target }}
+
+  bitrot:
+    name: Bitrot check
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          override: false
+      # Build benchmarks to prevent bitrot
+      - name: Build benchmarks
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --benches --examples --all-features
+
+  doc-links:
+    name: Intra-doc links
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          override: false
+      - name: cargo fetch
+        uses: actions-rs/cargo@v1
+        with:
+          command: fetch
+
+      # Ensure intra-documentation links all resolve correctly
+      # Requires #![deny(intra_doc_link_resolution_failure)] in crates.
+      - name: Check intra-doc links
+        uses: actions-rs/cargo@v1
+        with:
+          command: doc
+          args: --all --document-private-items
 
   fmt:
     name: Rustfmt
@@ -35,3 +106,4 @@ jobs:
         with:
           command: fmt
           args: --all -- --check
+