Tune memory usage

Vagrantfile

@@ -8,6 +8,6 @@ Vagrant.configure("2") do |config|
   config.vm.provision :shell, path: "bootstrap.sh"
 
   config.vm.provider "virtualbox" do |v|
-    v.memory = 6144
+    v.memory = 2048
   end
 end

bootstrap.sh

@@ -11,7 +11,6 @@ apt install -y \
   gnupg2 \
   qemu-user-static \
   software-properties-common \
-  swapspace \
   vim
 
 # Install docker-ce
@@ -49,4 +48,4 @@ if [ -f /vagrant/.github_publish ]; then
     echo "export GITHUB_TOKEN=$GITHUB_TOKEN"
     echo "export GITHUB_RELEASE_VERSION=$GITHUB_RELEASE_VERSION"
   } >> /etc/profile
-fi
+fi

src/debian-packages/cjdns/Makefile

@@ -52,7 +52,7 @@ build_bin_armhf: mkdir_build
 	mkdir -p $(BUILD_DIR)/docker/build
 	cd $(BUILD_DIR)/docker; \
 	  sudo docker build -t cjdns-armv7hf .    # Build armv7hf docker container
-	  sudo docker run --memory="5g" -v /usr/bin/qemu-arm-static:/usr/bin/qemu-arm-static -v $(BUILD_DIR)/docker/build:/tmp/cjdns cjdns-armv7hf    # Build binary in emulated ARM docker
+	  sudo docker run --memory="1g" -v /usr/bin/qemu-arm-static:/usr/bin/qemu-arm-static -v $(BUILD_DIR)/docker/build:/tmp/cjdns cjdns-armv7hf    # Build binary in emulated ARM docker (make sure we leave enough memory for the vagrant box otherwise the compilation hangs)
 	cd $(BUILD_DIR)/docker/build; \
 	  cp cjdroute $(BUILD_DIR)/bin/armhf/