diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
new file mode 100644
index 00000000..5c3ec25b
--- /dev/null
+++ b/.github/workflows/build.yaml
@@ -0,0 +1,92 @@
+name: Build Packages
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+  push:
+    branches: ["main"]
+
+jobs:
+  test:
+    if: github.event_name == 'pull_request'
+    runs-on: ${{ matrix.runner }}
+    environment: test
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: [self-hosted, macOS, ARM64]
+            enabled: true
+          - runner: [self-hosted, Linux, X64]
+            enabled: true
+
+    steps:
+      - name: Check out packages repository
+        uses: actions/checkout@v4
+
+      - name: Set environment variables
+        run: |
+          echo "TANGRAM_CI_DIR=$HOME/.tangram-ci" >> $GITHUB_ENV
+          echo "TG_EXE=$HOME/.tangram-ci/bin/tangram" >> $GITHUB_ENV
+
+      - name: Configure Tangram
+        run: |
+          mkdir -p "$TANGRAM_CI_DIR/bin"
+          cat > "$TANGRAM_CI_DIR/config.json" << 'EOF'
+          {
+            "remotes": []
+          }
+          EOF
+          cat > "$TANGRAM_CI_DIR/bin/tangram" << 'EOF'
+          #!/bin/sh
+          exec tangram --directory "$TANGRAM_CI_DIR/.tangram" --config "$TANGRAM_CI_DIR/config.json" "$@"
+          EOF
+          chmod +x "$TANGRAM_CI_DIR/bin/tangram"
+
+      - name: Test packages
+        if: matrix.enabled
+        shell: bash
+        run: |
+          bun run auto --test --sequential
+
+  release:
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    runs-on: ${{ matrix.runner }}
+    environment: release
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: [self-hosted, macOS, ARM64]
+            enabled: true
+          - runner: [self-hosted, Linux, X64]
+            enabled: true
+
+    steps:
+      - name: Check out packages repository
+        uses: actions/checkout@v4
+
+      - name: Set environment variables
+        run: |
+          echo "TANGRAM_CI_DIR=$HOME/.tangram-ci" >> $GITHUB_ENV
+          echo "TG_EXE=$HOME/.tangram-ci/bin/tangram" >> $GITHUB_ENV
+
+      - name: Configure Tangram
+        run: |
+          mkdir -p "$TANGRAM_CI_DIR/bin"
+          cat > "$TANGRAM_CI_DIR/config.json" << 'EOF'
+          {
+            "remotes": []
+          }
+          EOF
+          cat > "$TANGRAM_CI_DIR/bin/tangram" << 'EOF'
+          #!/bin/sh
+          exec tangram --directory "$TANGRAM_CI_DIR/.tangram" --config "$TANGRAM_CI_DIR/config.json" "$@"
+          EOF
+          chmod +x "$TANGRAM_CI_DIR/bin/tangram"
+
+      - name: Release packages
+        if: matrix.enabled
+        shell: bash
+        run: |
+          bun run auto --release --sequential
diff --git a/.gitignore b/.gitignore
index c291c9fd..e1ddf8b1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 node_modules
 tangram.lock
 target
+Claude.md