docker: really work around rustup issue

Author: Xyene

.docker/tier1/Dockerfile

@@ -4,7 +4,6 @@ ARG TAG=master
 RUN mkdir /judge && cd /judge && \
 	curl -L https://github.com/DMOJ/judge-server/archive/"${TAG}".tar.gz | tar -xz --strip-components=1 && \
 	pip3 install -e . && \
-	sed -i 's/source/./' ~judge/.profile && \
 	. ~judge/.profile && \
 	runuser -u judge -w PATH -- dmoj-autoconf -V > /judge-runtime-paths.yml && \
 	echo '  crt_x86_in_lib32: true' >> /judge-runtime-paths.yml

.docker/tier2/Dockerfile

@@ -4,7 +4,6 @@ ARG TAG=master
 RUN mkdir /judge && cd /judge && \
 	curl -L https://github.com/DMOJ/judge-server/archive/"${TAG}".tar.gz | tar -xz --strip-components=1 && \
 	pip3 install -e . && \
-	sed -i 's/source/./' ~judge/.profile && \
 	. ~judge/.profile && \
 	runuser -u judge -w PATH -- dmoj-autoconf -V > /judge-runtime-paths.yml && \
 	echo '  crt_x86_in_lib32: true' >> /judge-runtime-paths.yml

.docker/tier3/Dockerfile

@@ -4,7 +4,7 @@ ARG TAG=master
 RUN mkdir /judge && cd /judge && \
 	curl -L https://github.com/DMOJ/judge-server/archive/"${TAG}".tar.gz | tar -xz --strip-components=1 && \
 	pip3 install -e . && \
-	sed -i 's/source/./' ~judge/.profile && \
+	sed -i 's/source "$HOME/. "\/home\/judge/' ~judge/.profile && \
 	. ~judge/.profile && \
 	runuser -u judge -w PATH -- dmoj-autoconf -V > /judge-runtime-paths.yml && \
 	echo '  crt_x86_in_lib32: true' >> /judge-runtime-paths.yml