Add 1.2.0-rc1 sync gw

Author: Traun Leyden

community/sync-gateway/1.2.0-rc1/Dockerfile

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+FROM centos:centos7
+
+MAINTAINER Couchbase Docker Team <[email protected]>
+
+ENV GOPATH /opt/go
+ENV SGROOT /opt/sync_gateway
+ENV GOROOT /usr/local/go
+ENV PATH $PATH:$GOPATH/bin:$GOROOT/bin
+
+# Get dependencies
+RUN yum -y update && \
+    yum groupinstall -y development && \
+    yum install -y \
+    bc \
+    curl \
+    emacs-nox \
+    git \
+    mercurial \
+    wget 
+
+# Download and install Go
+RUN wget http://golang.org/dl/go1.5.2.linux-amd64.tar.gz && \
+    tar -C /usr/local -xzf go1.5.2.linux-amd64.tar.gz && \
+    rm go1.5.2.linux-amd64.tar.gz
+
+# install common go packages
+RUN go get github.com/tools/godep && \
+    go get github.com/nsf/gocode && \
+    go get golang.org/x/tools/cmd/goimports && \
+    go get github.com/golang/lint/golint && \
+    go get github.com/rogpeppe/godef
+
+# Build Sync Gateway
+RUN mkdir -p $GOPATH && \
+    cd /opt && \ 
+    git clone https://github.com/couchbase/sync_gateway.git && \
+    cd $SGROOT && \
+    git checkout 1.2.0-rc1 && \	
+    git submodule update --init --recursive && \
+    ./build.sh && \
+    cp bin/sync_gateway /usr/local/bin && \
+    mkdir -p $SGROOT/data
+
+ENTRYPOINT ["/usr/local/bin/sync_gateway"]
+
+# Expose ports
+EXPOSE 4984 4985

community/sync-gateway/1.2.0-rc1/README.md

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+
+Docker container for [Couchbase Sync Gateway](https://github.com/couchbase/sync_gateway).
+
+## Quickstart
+
+To run the latest release of Sync Gateway with a configuration file hosted in a github gist:
+
+```
+$ docker run -p 4984:4984 -p 4985:4985 couchbase/sync-gateway http://git.io/vfQpe
+```