Added Dockerfile

contrib/docker/Dockerfile

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+FROM alpine:latest
+LABEL authors "Darknet Villain <supervillain@riseup.net>"
+
+ENV PYSEEDER_HOME="/home/pyseeder"
+ENV DATA_DIR="${PYSEEDER_HOME}/data"
+
+RUN mkdir -p "$PYSEEDER_HOME" "$DATA_DIR" "$DATA_DIR"/data "$DATA_DIR"/output \
+    && adduser -S -h "$PYSEEDER_HOME" pyseeder \
+    && chown -R pyseeder:nobody "$PYSEEDER_HOME" \
+    && chmod -R 700 "$DATA_DIR"
+
+RUN apk --no-cache add python3 py3-pip build-base git openssl-dev musl-dev python3-dev libffi-dev \
+    && pip3 install --no-cache-dir https://github.com/PurpleI2P/pyseeder/zipball/master \
+    && apk --purge del python3 py3-pip build-base git openssl-dev musl-dev python3-dev libffi-dev 
+
+# 2. Adding required libraries to run i2pd to ensure it will run.
+RUN apk --no-cache add python3 openssl
+
+VOLUME "$DATA_DIR"
+USER pyseeder
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod a+x /entrypoint.sh
+
+EXPOSE 8443
+
+ENTRYPOINT [ "/entrypoint.sh" ]
+

contrib/docker/README.md

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+Pyseeder docker container
+=========================
+
+Using it with i2pd container:
+
+1) Run i2pd docker container and locate it's datadir volume with `docker inspect <container>`
+
+   It will show something like that:
+
+        ...
+
+        "Mounts": [
+            {
+                "Name": "69c5fb747b09701acebcf22478f99719e87ac65b3ac11464cd949bebe03a744a",
+                "Source": "/var/lib/docker/volumes/69c5fb747b09701acebcf22478f99719e87ac65b3ac11464cd949bebe03a744a/_data",
+                "Destination": "/home/i2pd/data",
+                "Driver": "local",
+                "Mode": "",
+                "RW": true,
+                "Propagation": ""
+            }
+        ],
+
+        ...
+
+2) Run pyseeder image with that volume mounted at `/i2pd_data`:
+
+    docker run --name=test10 -P -dt -v 69c5fb747b09701acebcf22478f99719e87ac65b3ac11464cd949bebe03a744a:/i2pd_data pyseeder
+
+3) Enjoy your reseed.

contrib/docker/entrypoint.sh

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+#!/bin/sh
+COMMAND="pyseeder"
+
+if [ "$1" = "--help" ]; then
+    $COMMAND --help
+else
+    # TODO
+    # make configurable SIGNER_ID and cert, key etc
+
+    DATA_DIR="/home/pyseeder/data"
+    SIGNER_ID="test@mail.i2p"
+    PRIVKEY_FILE="$DATA_DIR/data/private_key.pem"
+    CERT_FILE=` echo $DATA_DIR/data/$SIGNER_ID.crt | sed 's/@/_at_/' `
+    RESEED_FILE="$DATA_DIR/output/i2pseeds.su3"
+    I2PD_DIR="/i2pd_data"
+
+    $COMMAND keygen --signer-id $SIGNER_ID --no-encrypt \
+        --private-key $PRIVKEY_FILE --cert $CERT_FILE
+    $COMMAND reseed --netdb $I2PD_DIR/netDb --signer-id $SIGNER_ID --no-encrypt \
+        --private-key $PRIVKEY_FILE --outfile $RESEED_FILE
+    $COMMAND serve --private-key $PRIVKEY_FILE --cert $CERT_FILE --file $RESEED_FILE
+fi
+