Added Dockerfile

Dockerfile

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+FROM golang:1.10.0-alpine3.7
+
+WORKDIR /go/src/shiori
+COPY . .
+
+# Install git and gcc
+# Get dependencies
+# Install dependencies
+# Create shiori.db as a file, so in case that the file
+# is mounted with -v, a folder will not be created
+RUN apk --no-cache add git build-base \
+&& go get -d -v ./... \
+&& go install -v ./... \
+&& touch shiori.db
+
+CMD ["shiori", "serve"]