ci: Use mold linker in CI (#379)

I'm not sure if this really helps much -- the CI time is largely
dominated by compilation time vs linker time I believe. It doesn't seem
to hurt though.

Closes #378

.github/workflows/ci.yml

@@ -17,6 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       - uses: taiki-e/install-action@nextest
@@ -30,6 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       - uses: taiki-e/install-action@nextest
@@ -43,6 +45,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       # protoc is needed to build examples that have grpc enabled
@@ -55,6 +58,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       # protoc is needed to build examples that have grpc enabled
@@ -67,6 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       # protoc is needed to build examples that have grpc enabled
@@ -91,6 +96,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       - run: cargo hack check --rust-version --all-targets --ignore-private --log-group github-actions
@@ -101,6 +107,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       - uses: taiki-e/install-action@cargo-minimal-versions

.github/workflows/coverage.yml

@@ -21,6 +21,7 @@ jobs:
         with:
           components: llvm-tools-preview
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@nextest
       - uses: taiki-e/install-action@cargo-llvm-cov

.github/workflows/feature_powerset.yml

@@ -50,6 +50,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       - uses: taiki-e/install-action@nextest
@@ -67,6 +68,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       # protoc is needed to build examples that have grpc enabled
@@ -81,6 +83,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       # protoc is needed to build examples that have grpc enabled
@@ -95,6 +98,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       # protoc is needed to build examples that have grpc enabled