Add Dockerfile (#129)

* working alpine Dockerfile usable for local and autobuild

* removed volumes

Dockerfile

@@ -0,0 +1,28 @@
+FROM golang:1.7-alpine
+
+# Copy in the git repo from the build context
+COPY . /go/src/github.com/tus/tusd/
+
+# Create app directory
+
+RUN addgroup -g 1000 tusd \
+    && adduser -u 1000 -G tusd -s /bin/sh -D tusd \
+    && cd /go/src/github.com/tus/tusd \
+    && apk add --no-cache \
+        git \
+    && go get -d -v ./... \
+    && version="$(git tag -l --points-at HEAD)" \
+    && commit=$(git log --format="%H" -n 1) \
+    && GOOS=linux GOARCH=amd64 go build \
+        -ldflags="-X github.com/tus/tusd/cmd/tusd/cli.VersionName=${version} -X github.com/tus/tusd/cmd/tusd/cli.GitCommit=${commit} -X 'github.com/tus/tusd/cmd/tusd/cli.BuildDate=$(date --utc)'" \
+        -o "/go/bin/tusd" ./cmd/tusd/main.go \
+    && mkdir -p /srv/tusd-data \
+    && mkdir -p /srv/tusd-hooks \
+    && chown tusd:tusd /srv/tusd-data \
+    && rm -r /go/src/* \
+    && apk del git
+
+WORKDIR /srv/tusd-data
+EXPOSE 1080
+USER tusd
+ENTRYPOINT ["/go/bin/tusd","-dir","/srv/tusd-data","--hooks-dir","/srv/tusd-hooks"]