Added Dockerfile

Dockerfile

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+################## Dockerfile for 'pwndrop' server ##################
+#                                                                   #
+#####################################################################
+#       CONTAINERISED PWNDROP BUILT ON TOP OF ALPINE LINUX          #
+#-------------------------------------------------------------------#
+#                   Built and maintained by                         #
+#                       Harsha Vardhan J                            #
+#               https://github.com/HarshaVardhanJ                   #
+#####################################################################
+#                                                                   #
+# This Dockerfile does the following:                               #
+#                                                                   #
+#    1. Starts with a pinned-version of Golang Alpine for the       # 
+#       first stage of the build.                                   #
+#    2. Updates package repository information.                     #
+#    3. Installs packages necessary for building 'pwndrop'.         # 
+#    5. Downloads a pinned-version of the release of 'pwndrop' and  #
+#       extracts the tar ball.                                      #
+#    6. Builds the binary from the source code.                     #
+#    7. Starts with a pinned-version of Alpine for the final stage. #
+#    8. Copies the necessary files from the first stage.            #
+#    9. Updates the PATH variable to include the path under which   #
+#       'pwndrop' will be installed.                                #
+#   10. Updates package repository information.                     #
+#   11. Installs package necessary for installing 'pwndrop' as a    #
+#       daemon/service.                                             #
+#   12. Installs the 'pwndrop' exectable and checks if the service  #
+#       can be started and stopped.                                 #
+#   13. Cleans up by removing installation files and packages.      #
+#   14. Sets the ports to be exposed.                               #
+#   15. Sets the volume where data for 'pwndrop' will be stored.    #
+#   16. Starts the 'pwndrop' executable as the main command.        #
+#   17. Sets the arguments to the 'pwndrop' executable.             #
+#                                                                   #
+# Note : Do not forget to bind-mount a directory to the container   #
+#        at the path declared by the VOLUME directive. This is      #
+#        where the data will be stored.                             #
+#        Also, do not forget to expose ports on the host machine    #
+#        on which 'pwndrop' listens(port 53, 80, 443).              #
+#                                                                   #
+#####################################################################
+
+# Start with golang:1.13-alpine as Go version 1.13 
+# is the minimum version required by 'pwndrop'
+FROM golang:1.13-alpine AS builder
+
+# ARG value for link to repository which will be cloned
+ARG REPO_LINK="https://github.com/kgretzky/pwndrop.git"
+ARG PWNDROP_VERSION=1.0.0
+
+# Update repo info
+#
+RUN apk update --no-cache \
+    # Install the packages needed to build 'pwndrop'
+    #
+    && apk add --no-cache \
+      gcc \
+      make \
+    # Download the pinned release of 'pwndrop'
+    #
+    && wget https://github.com/kgretzky/pwndrop/archive/$PWNDROP_VERSION.tar.gz -O pwndrop.tar.gz \
+    # Extract the tarball
+    #
+    && tar -xzf pwndrop.tar.gz \
+    && mv pwndrop-* pwndrop \
+    && cd pwndrop \
+    # Build the binary
+    #
+    && make
+
+
+# Using Alpine for final stage
+FROM alpine:3.11.5
+
+# Copy required files from build stage
+COPY --from=builder /go/pwndrop/build /pwndrop
+
+# ARG values for injecting metadata during build time
+# NOTE: When using ARGS in a multi-stage build, remember to redeclare
+#       them for the stage that needs to use it. ARGs last only for the
+#       lifetime of the stage that they're declared in.
+ARG BUILD_DATE
+ARG VCS_REF
+ARG VERSION=1.0.0
+
+# Setting PATH variable to include the installation path of 'pwndrop'
+ENV PATH="/usr/local/pwndrop:${PATH}"
+
+# Set the working directory
+WORKDIR /pwndrop
+
+# Update repo info
+#
+RUN apk update --no-cache \
+    # Install necessary packages
+    #
+    && apk add --no-cache openrc \
+    # Install 'pwndrop'
+    #
+    && ./pwndrop install \
+    # Check if 'pwndrop' starts
+    #
+    && ./pwndrop start \
+    && ./pwndrop status \
+    && ./pwndrop stop \
+    # Cleanup after installation
+    #
+    && rm -rf /pwndrop \
+    && rm -rf /lib/apk/db/scripts.tar
+
+# Expose DNS, HTTP, HTTPS ports
+EXPOSE 53 80 443
+
+# Setting the volume where data is stored
+VOLUME ["/usr/local/pwndrop/data"]
+
+# Entrypoint command which will be executed when container runs
+ENTRYPOINT ["pwndrop"]
+
+# Arguments to the entrypoint command
+CMD ["-config", "/usr/local/pwndrop/pwndrop.ini", "-debug", "-no-autocert", "start"]
+
+# Labels
+LABEL org.opencontainers.image.vendor="Harsha Vardhan J" \
+      org.opencontainers.image.authors="https://github.com/HarshaVardhanJ" \
+      org.opencontainers.image.title="pwndrop" \
+      org.opencontainers.image.licenses="GPLv3 AND MIT" \
+      org.opencontainers.image.url="https://github.com/HarshaVardhanJ/docker_files/tree/master/pwndrop" \
+      org.label-schema.vcs-url="https://github.com/HarshaVardhanJ/docker_files/tree/master/pwndrop" \
+      org.opencontainers.image.documentation="https://github.com/HarshaVardhanJ/docker_files/blob/master/pwndrop/README.md" \
+      org.opencontainers.image.source="https://github.com/HarshaVardhanJ/docker_files/blob/master/pwndrop/Dockerfile" \
+      org.opencontainers.image.description="Self-deployable file hosting service for red teamers, allowing to easily upload \
+      and share payloads over HTTP and WebDAV." \
+      org.opencontainers.image.created=$BUILD_DATE \
+      org.label-schema.build-date=$BUILD_DATE \
+      org.opencontainers.image.revision=$VCS_REF \
+      org.label-schema.vcs-ref=$VCS_REF \
+      org.opencontainers.image.version=$VERSION \
+      org.label-schema.version=$VERSION \
+      org.label-schema.schema-version="1.0" \
+      software.author.repository="https://github.com/kgretzky/pwndrop" \
+      software.release.version=$VERSION