chore: format Dockerfile

Signed-off-by: Aofei Sheng <aofei@aofeisheng.com>

Dockerfile

@@ -6,10 +6,10 @@ ARG CLOUDFLARE_WARP_VERSION
 ENV BUILD_ONLY_DEPS="lsb-release curl xz-utils"
 
 RUN apt-get update && apt-get install -y ${BUILD_ONLY_DEPS} gnupg
-RUN for TARBALL in s6-overlay-noarch.tar.xz s6-overlay-$(uname -m).tar.xz; do curl -fsSL https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/${TARBALL} | tar -xpJ -C /; done
+RUN for TARBALL in s6-overlay-noarch.tar.xz "s6-overlay-$(uname -m).tar.xz"; do curl -fsSL "https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/${TARBALL}" | tar -xpJ -C /; done
 RUN curl -fsSL https://pkg.cloudflareclient.com/pubkey.gpg | gpg --dearmor -o /usr/share/keyrings/cloudflare-client-archive-keyring.gpg
 RUN echo "deb [signed-by=/usr/share/keyrings/cloudflare-client-archive-keyring.gpg] https://pkg.cloudflareclient.com $(lsb_release -cs) main" > /etc/apt/sources.list.d/cloudflare-client.list
-RUN apt-get update && apt-get install -y cloudflare-warp${CLOUDFLARE_WARP_VERSION:+"=${CLOUDFLARE_WARP_VERSION}"}
+RUN apt-get update && apt-get install -y cloudflare-warp"${CLOUDFLARE_WARP_VERSION:+=${CLOUDFLARE_WARP_VERSION}}"
 RUN apt-get purge -y --auto-remove ${BUILD_ONLY_DEPS} && apt-get clean && rm -rf /var/lib/apt/lists/*
 RUN rm -rf /tmp/* /var/tmp/*