Added garbage collector to builder image

.woodpecker/.build.yml

@@ -6,6 +6,8 @@ matrix:
 
 # These checks already get performed on the feature branches
 platform: ${PLATFORM}
+depends_on:
+  - builder
 
 pipeline:
   # The default build isn't needed, as alpine switches to gcc for the compiler anyways

Dockerfile.builder

@@ -18,6 +18,7 @@ RUN ln -s /opt/vlang/v /usr/bin/v && \
     sqlite-static sqlite-dev \
     libx11-dev glfw-dev freetype-dev \
     libarchive-static libarchive-dev \
+    gc-dev \
     diffutils
 
 COPY patches ./patches