diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 590f34c..ea621ce 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -22,17 +22,22 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
 
-      - name: Check Rust toolchain is preinstalled
+      - name: Use preinstalled Rust toolchain
         run: |
-          rustup --version
-          rustup toolchain list
-          rustup toolchain list | grep -F '1.85.0' >/dev/null || {
-            echo 'Rust 1.85.0 is not installed in the Gitea runner image.' >&2
-            echo 'Install it on the runner image/host before running CI:' >&2
-            echo 'rustup toolchain install 1.85.0 --profile minimal --component clippy --component rustfmt' >&2
+          set -eu
+          toolchain_dir="${RUSTUP_HOME:-$HOME/.rustup}/toolchains/1.85.0-x86_64-unknown-linux-gnu"
+          toolchain_bin="$toolchain_dir/bin"
+          if [ ! -x "$toolchain_bin/rustc" ] || [ ! -x "$toolchain_bin/cargo" ]; then
+            echo "Rust 1.85.0 is not preinstalled at $toolchain_dir." >&2
+            echo "Install it in the Gitea runner image/host before running CI:" >&2
+            echo "rustup toolchain install 1.85.0 --profile minimal --component clippy --component rustfmt" >&2
             exit 1
-          }
-          rustup component list --toolchain 1.85.0 --installed
+          fi
+          printf '%s\n' "$toolchain_bin" >> "$GITHUB_PATH"
+          "$toolchain_bin/rustc" --version
+          "$toolchain_bin/cargo" --version
+          "$toolchain_bin/rustfmt" --version
+          "$toolchain_bin/cargo-clippy" --version
 
       - name: Verify runner toolchain
         run: |
@@ -116,17 +121,22 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
 
-      - name: Check Rust toolchain is preinstalled
+      - name: Use preinstalled Rust toolchain
         run: |
-          rustup --version
-          rustup toolchain list
-          rustup toolchain list | grep -F '1.85.0' >/dev/null || {
-            echo 'Rust 1.85.0 is not installed in the Gitea runner image.' >&2
-            echo 'Install it on the runner image/host before running CI:' >&2
-            echo 'rustup toolchain install 1.85.0 --profile minimal --component clippy --component rustfmt' >&2
+          set -eu
+          toolchain_dir="${RUSTUP_HOME:-$HOME/.rustup}/toolchains/1.85.0-x86_64-unknown-linux-gnu"
+          toolchain_bin="$toolchain_dir/bin"
+          if [ ! -x "$toolchain_bin/rustc" ] || [ ! -x "$toolchain_bin/cargo" ]; then
+            echo "Rust 1.85.0 is not preinstalled at $toolchain_dir." >&2
+            echo "Install it in the Gitea runner image/host before running CI:" >&2
+            echo "rustup toolchain install 1.85.0 --profile minimal --component clippy --component rustfmt" >&2
             exit 1
-          }
-          rustup component list --toolchain 1.85.0 --installed
+          fi
+          printf '%s\n' "$toolchain_bin" >> "$GITHUB_PATH"
+          "$toolchain_bin/rustc" --version
+          "$toolchain_bin/cargo" --version
+          "$toolchain_bin/rustfmt" --version
+          "$toolchain_bin/cargo-clippy" --version
 
       - name: Verify runner toolchain
         run: |
diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index 2e61a89..2a2e1a4 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -22,17 +22,22 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v5
 
-      - name: Check Rust toolchain is preinstalled
+      - name: Use preinstalled Rust toolchain
         run: |
-          rustup --version
-          rustup toolchain list
-          rustup toolchain list | grep -F '1.85.0' >/dev/null || {
-            echo 'Rust 1.85.0 is not installed in the Gitea runner image.' >&2
-            echo 'Install it on the runner image/host before running CI:' >&2
-            echo 'rustup toolchain install 1.85.0 --profile minimal --component clippy --component rustfmt' >&2
+          set -eu
+          toolchain_dir="${RUSTUP_HOME:-$HOME/.rustup}/toolchains/1.85.0-x86_64-unknown-linux-gnu"
+          toolchain_bin="$toolchain_dir/bin"
+          if [ ! -x "$toolchain_bin/rustc" ] || [ ! -x "$toolchain_bin/cargo" ]; then
+            echo "Rust 1.85.0 is not preinstalled at $toolchain_dir." >&2
+            echo "Install it in the Gitea runner image/host before running CI:" >&2
+            echo "rustup toolchain install 1.85.0 --profile minimal --component clippy --component rustfmt" >&2
             exit 1
-          }
-          rustup component list --toolchain 1.85.0 --installed
+          fi
+          printf '%s\n' "$toolchain_bin" >> "$GITHUB_PATH"
+          "$toolchain_bin/rustc" --version
+          "$toolchain_bin/cargo" --version
+          "$toolchain_bin/rustfmt" --version
+          "$toolchain_bin/cargo-clippy" --version
 
       - name: Verify runner toolchain
         run: |