test: use git clone --bare instead of manual mv

Author: weihanglo

crates/cargo-test-support/containers/apache/Dockerfile

@@ -10,10 +10,9 @@ RUN git config --global user.email "[email protected]" &&\
     git init -b master . &&\
     git add Cargo.toml src &&\
     git commit -m "Initial commit" &&\
-    mv .git ../bar.git &&\
-    cd ../bar.git &&\
-    git config --bool core.bare true &&\
-    rm -rf ../bar
+    cd .. &&\
+    git clone --bare bar bar.git &&\
+    rm -rf bar
 WORKDIR /
 
 EXPOSE 443

crates/cargo-test-support/containers/sshd/Dockerfile

@@ -17,10 +17,9 @@ RUN git config --global user.email "[email protected]" &&\
     git init -b master . &&\
     git add Cargo.toml src &&\
     git commit -m "Initial commit" &&\
-    mv .git ../bar.git &&\
-    cd ../bar.git &&\
-    git config --bool core.bare true &&\
-    rm -rf ../bar
+    cd .. &&\
+    git clone --bare bar bar.git &&\
+    rm -rf bar
 WORKDIR /
 USER root