fix(ci): Replace Mozilla sccache action with token-free alternative

Switch from mozilla-actions/sccache-action to git.tomfos.tr/tom/sccache-action@v1
which eliminates GitHub token requirements for downloading sccache binaries.

Removes token input parameter and debug logging from sccache action, and
simplifies setup-rust action by removing sccache token availability checks.
This ensures reliable sccache access for all contributors regardless of
repository permissions or rate limits.

.forgejo/actions/sccache/action.yml

@@ -2,18 +2,12 @@ name: sccache
 description: |
   Install sccache for caching builds in GitHub Actions.
 
-inputs:
-  token:
-    description: 'A Github PAT'
-    required: false
 
 runs:
   using: composite
   steps:
   - name: Install sccache
-    uses: https://github.com/mozilla-actions/sccache-action@v0.0.9
-    with:
-      token: ${{ env.GH_PUBLIC_RO || inputs.token }}
+    uses: https://git.tomfos.tr/tom/sccache-action@v1
   - name: Configure sccache
     uses: https://github.com/actions/github-script@v7
     with:

.forgejo/actions/setup-rust/action.yml

@@ -88,21 +88,9 @@ runs:
         # Shared toolchain cache across all Rust versions
         key: toolchain-${{ steps.runner-os.outputs.slug }}
 
-    - name: Debug GitHub token availability
-      shell: bash
-      run: |
-        if [ -n "$GH_PUBLIC_RO" ]; then
-          echo "✅ Using GH_PUBLIC_RO environment variable for sccache"
-        elif [ -z "${{ inputs.github-token }}" ]; then
-          echo "⚠️ No GitHub token provided - sccache will use fallback download method"
-        else
-          echo "✅ Using github-token input for sccache"
-        fi
 
     - name: Setup sccache
-      uses: https://github.com/mozilla-actions/sccache-action@v0.0.9
-      with:
-        token: ${{ env.GH_PUBLIC_RO || inputs.github-token }}
+      uses: https://git.tomfos.tr/tom/sccache-action@v1
 
     - name: Cache build artifacts
       id: build-cache