fix(fuzzing): set CRS_PATH so fuzzers find CRS under read-only rootfs

The ContFuzzer platform runs containers with HOME=/tmp and a read-only
root filesystem. Three fuzzers (ipa, avm prover, translator_composer)
call bb_crs_path() which defaults to $HOME/.bb-crs — missing on tmpfs.
Setting CRS_PATH explicitly points them at the baked-in /root/.bb-crs.

Author: randyquaye

container-builds/fuzzing-container/src/Dockerfile

@@ -106,6 +106,7 @@ COPY --from=builder /home/fuzzer/aztec-packages/barretenberg/cpp/build-fuzzing-c
 
 # Copy CRS
 COPY --from=builder /root/.bb-crs /root/.bb-crs
+ENV CRS_PATH=/root/.bb-crs
 
 # Copy flattened target binaries
 COPY --from=builder /targets/ /targets/

container-builds/fuzzing-container/src/Dockerfile.private

@@ -110,6 +110,7 @@ COPY --from=builder /home/fuzzer/aztec-packages/barretenberg/cpp/build-fuzzing-c
 
 # Copy CRS
 COPY --from=builder /root/.bb-crs /root/.bb-crs
+ENV CRS_PATH=/root/.bb-crs
 
 # Copy flattened target binaries
 COPY --from=builder /targets/ /targets/