fix: normalize rust cache keys

.gitea/actions/rust-cache/action.yml

@@ -24,6 +24,8 @@ runs:
       id: cache-key
       shell: bash
       run: |
+        OS=$(printf '%s' '${{ runner.os }}' | tr '[:upper:]' '[:lower:]')
+        ARCH=$(printf '%s' '${{ runner.arch }}' | tr '[:upper:]' '[:lower:]')
         {
           printf 'toolchain=%s\n' '${{ inputs.toolchain }}'
           find . \
@@ -35,8 +37,8 @@ runs:
         } > /tmp/rust-cache-fingerprint
         HASH=$(sha256sum /tmp/rust-cache-fingerprint | cut -d' ' -f1)
         echo "hash=$HASH" >> $GITHUB_OUTPUT
-        echo "key=${{ inputs.cache-prefix }}-${{ runner.os }}-${{ runner.arch }}-${{ inputs.toolchain }}-$HASH" >> $GITHUB_OUTPUT
-        echo "restore-prefix=${{ inputs.cache-prefix }}-${{ runner.os }}-${{ runner.arch }}-${{ inputs.toolchain }}-" >> $GITHUB_OUTPUT
+        echo "key=${{ inputs.cache-prefix }}-$OS-$ARCH-${{ inputs.toolchain }}-$HASH" >> $GITHUB_OUTPUT
+        echo "restore-prefix=${{ inputs.cache-prefix }}-$OS-$ARCH-${{ inputs.toolchain }}-" >> $GITHUB_OUTPUT
 
     - name: Restore Rust cache
       id: cache-restore
@@ -54,6 +56,12 @@ runs:
         restore-keys: |
           ${{ steps.cache-key.outputs.restore-prefix }}
 
+    - name: Show Rust cache status
+      shell: bash
+      run: |
+        echo "Rust cache key: ${{ steps.cache-key.outputs.key }}"
+        echo "Rust cache hit: ${{ steps.cache-restore.outputs.cache-hit }}"
+
     - name: Setup Rust
       shell: bash
       run: |