Install flip-link

Author: thejpster

.github/workflows/build.yml

@@ -12,5 +12,7 @@ jobs:
         submodules: true
     - name: Add Target
       run: rustup target add thumbv6m-none-eabi
+    - name: Install flip-link
+      run: cd / && cargo install flip-link
     - name: Build
       run: cargo build --verbose --target=thumbv6m-none-eabi