ci: provide rust sources for fuzz builds

Author: hyperpolymath

.clusterfuzzlite/Dockerfile

@@ -3,8 +3,10 @@
 
 FROM gcr.io/oss-fuzz-base/base-builder-rust
 
-# Install Rust nightly (required for cargo-fuzz)
-RUN rustup default nightly
+# Install Rust nightly and its source tree, both required by cargo-fuzz's
+# sanitizer builds.
+RUN rustup default nightly && \
+    rustup component add rust-src --toolchain nightly
 
 # Copy project files
 COPY . $SRC/valence-shell

.dockerignore

@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: MPL-2.0
+
+.git/
+.github/
+.idea/
+.vscode/
+
+target/
+**/target/
+_build/
+build/
+dist/
+out/
+tmp/
+logs/
+coverage/
+htmlcov/
+
+node_modules/
+vendor/
+deps/
+.elixir_ls/
+.stack-work/
+dist-newstyle/
+.lake/
+**/.lake/
+.zig-cache/
+zig-out/
+.cache/
+
+*.log
+*.tmp
+*.bak
+*.o
+*.so
+*.so.*
+*.dylib
+*.beam
+*.ali
+*.vo
+*.vok
+*.vos
+*.glob
+*.agdai