ci(docker): install all required scarb versions

Install scarb 2.8.2, 2.11.4, and 2.12.2 via asdf for building:
- Main contracts (2.8.2)
- AVNU contracts (2.11.4)
- VRF contracts (2.12.2)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: kariy

.github/Dockerfile

@@ -113,8 +113,15 @@ ENV ASDF_DATA_DIR=/root/.asdf
 RUN mkdir -p $ASDF_DATA_DIR
 ENV PATH="$ASDF_DATA_DIR/shims:$PATH"
 
-# Install scarb via asdf
-RUN asdf plugin add scarb && asdf install scarb 2.8.2 && asdf set scarb 2.8.2
+# Install scarb versions via asdf
+# - 2.8.2: main contracts
+# - 2.11.4: AVNU contracts
+# - 2.12.2: VRF contracts
+RUN asdf plugin add scarb && \
+	asdf install scarb 2.8.2 && \
+	asdf install scarb 2.11.4 && \
+	asdf install scarb 2.12.2 && \
+	asdf set scarb 2.8.2
 
 # Install caddy
 ARG TARGETPLATFORM