Add justfile for handling multiple coverage steps, prevent early termination of coverage job

Justfile

@@ -0,0 +1,16 @@
+set shell := ["bash", "-c"]
+set windows-shell := ["powershell.exe", "-NoLogo", "-Command"]
+
+coverage_exclude_pattern := "app.rs|audio.rs"
+
+coverage:
+    # Run & generate report
+    cargo llvm-cov \
+    --ignore-filename-regex "{{ coverage_exclude_pattern }}" \
+    --output-path lcov.info \
+    --profile coverage \
+    --no-fail-fast nextest
+
+    # Display report
+    cargo llvm-cov report \
+    --ignore-filename-regex "{{ coverage_exclude_pattern }}"