feat: add script to build trampolines

- easier to run locally
- cleans up CI workflow quite a bit

.github/workflows/trampoline.yaml

@@ -66,32 +66,22 @@ jobs:
         with:
           target: ${{ matrix.target }}
 
-      - name: Build trampoline binary
-        run: cargo build --release --target ${{ matrix.target }}
-
-      - name: Move trampoline binary on windows
-        if: startsWith(matrix.name, 'Windows')
-        run: |
-          mkdir -p trampolines-binaries
-          mv target/${{ matrix.target }}/release/pixi_trampoline.exe trampolines-binaries/pixi-trampoline-${{ matrix.target }}.exe
+      - name: Set up pixi
+        uses: prefix-dev/setup-pixi@v0.8.1
+        with:
+          environments: trampoline
 
-      - name: Move trampoline binary on unix
-        if: startsWith(matrix.name, 'Windows') == false
-        run: |
-          mkdir -p trampolines-binaries
-          mv target/${{ matrix.target }}/release/pixi_trampoline trampolines-binaries/pixi-trampoline-${{ matrix.target }}
+      - name: Build trampoline binary
+        run: pixi run build-trampoline --target ${{ matrix.target }}
 
-      - name: Upload binary artifact
+      - name: Upload binary artifact (Windows)
         uses: actions/upload-artifact@v4
         with:
           name: trampoline-${{ matrix.target }}
-          path: crates/pixi_trampoline/trampolines-binaries/
+          path: trampoline/binaries/pixi-trampoline-${{ matrix.target }}${{ matrix.os == 'windows-latest' && '.exe' || '' }}.zstd
 
   aggregate:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: crates/pixi_trampoline
     needs: build # This ensures the aggregation job runs after the build jobs
     steps:
       - name: Checkout code
@@ -100,34 +90,16 @@ jobs:
       - name: Download all binaries
         uses: actions/download-artifact@v4
         with:
-          path: crates/pixi_trampoline/trampolines-binaries/
+          path: trampoline/binaries/
 
       - name: List downloaded files
-        run: ls -R trampolines-binaries/
-
-      - name: Move trampolines
-        run: |
-          mkdir -p trampolines
-          # Iterate through all files in trampolines directory and its subdirectories
-          find trampolines-binaries -type f  -name 'pixi-trampoline-*' -exec mv -f {} trampolines/ \;
-          # now iterate through all files in trampolines directory and compress them using zstd
-          # and remove the original file
-          # by using -f we allow overwriting the file
-          for file in trampolines/*; do
-            # Skip files that are already compressed (end with .zst)
-            if [[ "$file" == *.zst ]]; then
-              continue
-            fi
-            zstd "$file" -f
-            rm "$file"
-          done
-          ls -R trampolines/
+        run: ls -R trampoline/binaries/
 
       - name: Upload binary artifact
         uses: actions/upload-artifact@v4
         with:
           name: trampolines
-          path: crates/pixi_trampoline/trampolines/
+          path: trampoline/binaries/
 
       - name: Commit and push updated binaries
         # Don't run on forks
@@ -136,7 +108,7 @@ jobs:
           # Set the repository to push to the repository the workflow is running on
           git config user.name "GitHub Actions"
           git config user.email "actions@github.com"
-          git add trampolines/
+          git add trampoline/binaries/
           git commit -m "[CI]: Update trampoline binaries for all targets"
           # Push changes to the branch that triggered the workflow
           BRANCH=${GITHUB_REF#refs/heads/}