fix(ci): pass toolchain explicitly to SHA-pinned dtolnay/rust-toolchain (#1)

dtolnay/rust-toolchain derives the toolchain from the ref it is called at
(@stable, @1.90). Pinned to a commit SHA, that ref carries no toolchain, so
the action fails with "'toolchain' is a required input". This broke the
Windows ARM64 workflow on every craft app's main (e.g. storytold/wordcraft
run on 860f4ca) and would break the macOS, Windows, Linux, web and riscv64
release jobs the same way. Pass toolchain: stable at every call site.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -168,6 +168,7 @@ jobs:
           ref: ${{ inputs.craft-fonts-ref }}
       - uses: dtolnay/rust-toolchain@e2a55d2ffb04f378e9626c28d38b36d230d1e12f # v1
         with:
+          toolchain: stable
           targets: aarch64-apple-darwin, x86_64-apple-darwin
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
@@ -274,6 +275,7 @@ jobs:
           ref: ${{ inputs.craft-fonts-ref }}
       - uses: dtolnay/rust-toolchain@e2a55d2ffb04f378e9626c28d38b36d230d1e12f # v1
         with:
+          toolchain: stable
           targets: ${{ matrix.target }}
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
@@ -375,6 +377,8 @@ jobs:
           deb-arch: ${{ matrix.deb }}
           nfpm-version: ${{ inputs.nfpm-version }}
       - uses: dtolnay/rust-toolchain@e2a55d2ffb04f378e9626c28d38b36d230d1e12f # v1
+        with:
+          toolchain: stable
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
           key: release-linux-${{ matrix.arch }}
@@ -640,6 +644,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: dtolnay/rust-toolchain@e2a55d2ffb04f378e9626c28d38b36d230d1e12f # v1
         with:
+          toolchain: stable
           targets: wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:
@@ -719,6 +724,7 @@ jobs:
           ref: ${{ inputs.craft-fonts-ref }}
       - uses: dtolnay/rust-toolchain@e2a55d2ffb04f378e9626c28d38b36d230d1e12f # v1
         with:
+          toolchain: stable
           targets: riscv64gc-unknown-linux-gnu
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with:

.github/workflows/windows-arm64.yml

@@ -48,6 +48,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - uses: dtolnay/rust-toolchain@e2a55d2ffb04f378e9626c28d38b36d230d1e12f # v1
         with:
+          toolchain: stable
           targets: aarch64-pc-windows-msvc
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
         with: