Fix shellcheck warnings (#72)

Author: johnboyes

entrypoint.sh

@@ -1,10 +1,10 @@
 #!/bin/sh
 
-export RUNNER_GITHUB_WORKSPACE_PATH=$1
-export RUNNER_HOVERFLY_INSTALL_PATH=$RUNNER_GITHUB_WORKSPACE_PATH/bin
-export CONTAINER_HOVERFLY_INSTALL_PATH=$GITHUB_WORKSPACE/bin
+export RUNNER_GITHUB_WORKSPACE_PATH="$1"
+export RUNNER_HOVERFLY_INSTALL_PATH="$RUNNER_GITHUB_WORKSPACE_PATH/bin"
+export CONTAINER_HOVERFLY_INSTALL_PATH="$GITHUB_WORKSPACE/bin"
 export HOVERFLY_PLATFORM=linux_amd64
-export HOVERFLY_VERSION=$INPUT_VERSION
+export HOVERFLY_VERSION="$INPUT_VERSION"
 export HOVERFLY_BUNDLE=hoverfly_bundle_$HOVERFLY_PLATFORM
 export HOVERFLY_DOWNLOAD_URL=https://github.com/SpectoLabs/hoverfly/releases/download/