ci: add more debug info - compare registry src timestamps and fingerprint content

Author: xdustinface

.github/workflows/build-and-test.yml

@@ -36,8 +36,12 @@ jobs:
           ls target/debug/.fingerprint/ 2>/dev/null | wc -l || echo "No fingerprints"
           echo "=== registry/src ==="
           ls ~/.cargo/registry/src/ 2>/dev/null | head -5 || echo "No registry src"
+          echo "=== memchr source file timestamp ==="
+          ls -la ~/.cargo/registry/src/*/memchr-*/src/lib.rs 2>/dev/null || echo "No memchr src"
           echo "=== sample dep fingerprint (memchr) ==="
           ls -la target/debug/.fingerprint/memchr-* 2>/dev/null || echo "No memchr fingerprint"
+          echo "=== memchr fingerprint content ==="
+          cat target/debug/.fingerprint/memchr-*/lib-memchr.json 2>/dev/null | head -5 || echo "No fingerprint json"
         shell: bash
       - name: Build workspace
         run: cargo test --workspace --all-features --no-run ${{ inputs.exclude-crates && format('--exclude {0}', inputs.exclude-crates) || '' }}
@@ -70,23 +74,20 @@ jobs:
           shared-key: "${{ inputs.os }}"
           save-if: false
           cache-all-crates: true
-      - name: Debug cache state (after cache restore, before artifact)
+      - name: Debug cache state (after cache restore)
         run: |
           echo "=== target/ directory ==="
           ls -la target/ 2>/dev/null | head -20 || echo "No target dir"
           echo "=== fingerprint count ==="
           ls target/debug/.fingerprint/ 2>/dev/null | wc -l || echo "No fingerprints"
           echo "=== registry/src ==="
           ls ~/.cargo/registry/src/ 2>/dev/null | head -5 || echo "No registry src"
+          echo "=== memchr source file timestamp ==="
+          ls -la ~/.cargo/registry/src/*/memchr-*/src/lib.rs 2>/dev/null || echo "No memchr src"
           echo "=== sample dep fingerprint (memchr) ==="
           ls -la target/debug/.fingerprint/memchr-* 2>/dev/null || echo "No memchr fingerprint"
-        shell: bash
-      - name: Debug state (after artifact download)
-        run: |
-          echo "=== fingerprint count ==="
-          ls target/debug/.fingerprint/ | wc -l
-          echo "=== sample dep fingerprint (memchr) ==="
-          ls -la target/debug/.fingerprint/memchr-*
+          echo "=== memchr fingerprint content ==="
+          cat target/debug/.fingerprint/memchr-*/lib-memchr.json 2>/dev/null | head -5 || echo "No fingerprint json"
         shell: bash
       - uses: actions/setup-python@v5
         with: