fix(ci): use clang-18 from ubuntu-24.04 native repos, drop data artifact

- Remove LLVM apt repo setup, clang-18 is available natively on ubuntu-24.04
- Switch all clang-21 references to clang-18 with matching Conan version
- Remove data/** from artifact upload path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: guzman109

.github/workflows/build.yaml

@@ -20,18 +20,16 @@ jobs:
 
       - name: Install system build tools
         run: |
-          wget -qO- https://apt.llvm.org/llvm-snapshot.gpg.key | sudo tee /etc/apt/trusted.gpg.d/apt.llvm.org.asc
-          echo "deb http://apt.llvm.org/noble/ llvm-toolchain-noble-21 main" | sudo tee /etc/apt/sources.list.d/llvm-21.list
           sudo apt-get update
           sudo apt-get install -y \
             cmake ninja-build git pkg-config \
-            clang-21 lld-21 \
-            libc++-21-dev libc++abi-21-dev \
+            clang-18 lld-18 \
+            libc++-18-dev libc++abi-18-dev \
             curl ca-certificates \
             meson
-          sudo ln -sf /usr/bin/clang-21 /usr/bin/clang
-          sudo ln -sf /usr/bin/clang++-21 /usr/bin/clang++
-          clang++-21 --version
+          sudo ln -sf /usr/bin/clang-18 /usr/bin/clang
+          sudo ln -sf /usr/bin/clang++-18 /usr/bin/clang++
+          clang++-18 --version
 
       - name: Install Conan
         uses: conan-io/setup-conan@v1
@@ -40,22 +38,22 @@ jobs:
 
       - name: Conan install
         env:
-          CC: clang-21
-          CXX: clang++-21
+          CC: clang-18
+          CXX: clang++-18
         run: |
           conan install . \
             --build=missing \
             -s build_type=Release \
             -s compiler=clang \
-            -s compiler.version=21 \
+            -s compiler.version=18 \
             -s compiler.libcxx=libc++ \
             -s compiler.cppstd=23 \
             -of build
 
       - name: Configure (CMake + Conan toolchain)
         env:
-          CC: clang-21
-          CXX: clang++-21
+          CC: clang-18
+          CXX: clang++-18
         run: |
           cmake -S . -B build -G Ninja \
             -DCMAKE_BUILD_TYPE=Release \
@@ -76,7 +74,6 @@ jobs:
           name: icicle-insights-linux-amd64
           path: |
             build/icicle-insights
-            data/**
           if-no-files-found: error
 
   docker:

justfile

@@ -39,16 +39,25 @@ run:
     {{ BUILD_DIR }}/icicle-insights
 
 docker-build:
-    docker buildx build --platform linux/amd64 -t ghcr.io/icicle-ai/insights:latest .
+  docker buildx build --platform linux/amd64 -t ghcr.io/icicle-ai/insights:latest .
 
 docker-run:
-    docker run -itd -p 3000:3000 --env-file=.env --name insights ghcr.io/icicle-ai/insights:latest
+  docker run -itd -p 3000:3000 --env-file=.env --name insights ghcr.io/icicle-ai/insights:latest
 
 act-build:
-    act -j docker \
-          --container-architecture linux/amd64 \
-          -P ubuntu-24.04=ghcr.io/catthehacker/ubuntu:act-24.04 \
-          --secret GITHUB_TOKEN="$(gh auth token)" \
-          --env SSL_CERT_FILE= \
-          --env CURL_CA_BUNDLE= \
-          --env REQUESTS_CA_BUNDLE=
+  act -j docker \
+        --container-architecture linux/amd64 \
+        -P ubuntu-24.04=ghcr.io/catthehacker/ubuntu:act-24.04 \
+        --secret GITHUB_TOKEN="$(gh auth token)" \
+        --env SSL_CERT_FILE= \
+        --env CURL_CA_BUNDLE= \
+        --env REQUESTS_CA_BUNDLE=
+
+act-linux:
+  act -j linux \
+        --container-architecture linux/amd64 \
+        -P ubuntu-24.04=ghcr.io/catthehacker/ubuntu:act-24.04 \
+        --secret GITHUB_TOKEN="$(gh auth token)" \
+        --env SSL_CERT_FILE= \
+        --env CURL_CA_BUNDLE= \
+        --env REQUESTS_CA_BUNDLE=