Dockerfile: copy dockerfile for arm with arm base image

Dockerfile.armhf

+# Pull base image.
+FROM quay.io/eris/build:arm
+MAINTAINER Eris Industries <support@erisindustries.com>
+
+# Expose ports for 1337:eris-db API; 46656:tendermint-peer; 46657:tendermint-rpc
+EXPOSE 1337
+EXPOSE 46656
+EXPOSE 46657
+
+#-----------------------------------------------------------------------------
+# install eris-db
+
+# set the source code path and copy the repository in
+ENV ERIS_DB_SRC_PATH $GOPATH/src/github.com/eris-ltd/eris-db
+COPY . $ERIS_DB_SRC_PATH
+
+# fetch and install eris-db and its dependencies
+	# install glide for dependency management
+RUN go get github.com/Masterminds/glide \
+	# build the main eris-db target
+	&& cd $ERIS_DB_SRC_PATH/cmd/eris-db \
+	&& go build \
+	&& cp eris-db $INSTALL_BASE/eris-db \
+	# copy the start script for eris-db \
+	&& cp $ERIS_DB_SRC_PATH/bin/start_eris_db $INSTALL_BASE \
+	&& chmod 755 $INSTALL_BASE/start_eris_db
+
+#-----------------------------------------------------------------------------
+# install mint-client [to be deprecated]
+
+ENV ERIS_DB_MINT_REPO github.com/eris-ltd/mint-client
+ENV ERIS_DB_MINT_SRC_PATH $GOPATH/src/$ERIS_DB_MINT_REPO
+
+WORKDIR $ERIS_DB_MINT_SRC_PATH
+
+RUN git clone --quiet https://$ERIS_DB_MINT_REPO . \
+	&& git checkout --quiet master \
+	&& go build -o $INSTALL_BASE/mintx ./mintx \
+	&& go build -o $INSTALL_BASE/mintconfig ./mintconfig 
+	# restrict build targets for re-evaluation
+	# && go build -o $INSTALL_BASE/mintdump ./mintdump \
+	# && go build -o $INSTALL_BASE/mintperms ./mintperms \
+	# && go build -o $INSTALL_BASE/mintunsafe ./mintunsafe \
+	# && go build -o $INSTALL_BASE/mintkey ./mintkey \
+	# && go build -o $INSTALL_BASE/mintgen ./mintgen \
+	# && go build -o $INSTALL_BASE/mintsync ./mintsync
+
+#-----------------------------------------------------------------------------
+# clean up [build container needs to be separated from shipped container]
+
+ RUN unset ERIS_DB_SRC_PATH \
+ 	&& unset ERIS_DB_MINT_SRC_PATH \
+ 	&& apk del --purge go git musl-dev \
+ 	&& rm -rf $GOPATH
+
+# mount the data container on the eris directory
+VOLUME $ERIS
+
+WORKDIR $ERIS
+
+ENTRYPOINT ["/usr/local/bin/start_eris_db"]
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