Update Dockerfile COPY syntax

Author: alexcrichton

docker/Dockerfile-beta

@@ -4,7 +4,7 @@ RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
       gcc libc6-dev curl file ca-certificates
 COPY bin/compile.sh bin/evaluate.sh /usr/local/bin/
-COPY install.sh /tmp
+COPY install.sh /tmp/
 RUN sh /tmp/install.sh beta
 USER nobody
 

docker/Dockerfile-nightly

@@ -4,7 +4,7 @@ RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
       gcc libc6-dev curl file ca-certificates
 COPY bin/compile.sh bin/evaluate.sh /usr/local/bin/
-COPY install.sh /tmp
+COPY install.sh /tmp/
 RUN sh /tmp/install.sh nightly
 USER nobody
 

docker/Dockerfile-stable

@@ -4,7 +4,7 @@ RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
       gcc libc6-dev curl file ca-certificates
 COPY bin/compile.sh bin/evaluate.sh /usr/local/bin/
-COPY install.sh /tmp
+COPY install.sh /tmp/
 RUN sh /tmp/install.sh stable
 USER nobody