bitbake: contrib: Add Dockerfile for building PR service

Adds a Dockerfile for building the PR service in a container.

Based on the hash equivalence server container [hashserv].

Use the following environment variables to configure the PR service
container:
- DBFILE: database filename. Default:
  /var/lib/bbprserv/prserv.sqlite3.
- LOGFILE: log filename. Default: /var/lib/bbprserv/prserv.log.
- LOGLEVEL: logging level. Default: DEBUG.
- HOST: ip address to bind. Default: 0.0.0.0.
- PORT: port number. Default: 8585.
- DBMODE: database mode. Default: Empty (RW).
Note: DBMODE in RO: "--read-only".

[hashserv]: contrib/hashserv/Dockerfile

(Bitbake rev: a5497428b539e8598263924f63a9df8fe1ea70f9)

(Bitbake rev: 1d05abd92da56e284fcd904cf32bd12485903f10)

Signed-off-by: Daniel Gomez <daniel@qtec.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/contrib/prserv/Dockerfile

@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: MIT
+#
+# Copyright (c) 2022 Daniel Gomez <daniel@qtec.com>
+#
+# Dockerfile to build a bitbake PR service container
+#
+# From the root of the bitbake repository, run:
+#
+#   docker build -f contrib/prserv/Dockerfile . -t prserv
+#
+# Running examples:
+#
+# 1. PR Service in RW mode, port 18585:
+#
+# docker run --detach --tty \
+# --env PORT=18585 \
+# --publish 18585:18585 \
+# --volume $PWD:/var/lib/bbprserv \
+# prserv
+#
+# 2. PR Service in RO mode, default port (8585) and custom LOGFILE:
+#
+# docker run --detach --tty \
+# --env DBMODE="--read-only" \
+# --env LOGFILE=/var/lib/bbprserv/prservro.log \
+# --publish 8585:8585 \
+# --volume $PWD:/var/lib/bbprserv \
+# prserv
+#
+
+FROM alpine:3.14.4
+
+RUN apk add --no-cache python3
+
+COPY bin/bitbake-prserv /opt/bbprserv/bin/
+COPY lib/prserv /opt/bbprserv/lib/prserv/
+COPY lib/bb /opt/bbprserv/lib/bb/
+COPY lib/codegen.py /opt/bbprserv/lib/codegen.py
+COPY lib/ply /opt/bbprserv/lib/ply/
+COPY lib/bs4 /opt/bbprserv/lib/bs4/
+
+ENV PATH=$PATH:/opt/bbprserv/bin
+
+RUN mkdir -p /var/lib/bbprserv
+
+ENV DBFILE=/var/lib/bbprserv/prserv.sqlite3 \
+    LOGFILE=/var/lib/bbprserv/prserv.log \
+    LOGLEVEL=debug \
+    HOST=0.0.0.0 \
+    PORT=8585 \
+    DBMODE=""
+
+ENTRYPOINT [ "/bin/sh", "-c", \
+"bitbake-prserv \
+--file=$DBFILE \
+--log=$LOGFILE \
+--loglevel=$LOGLEVEL \
+--start \
+--host=$HOST \
+--port=$PORT \
+$DBMODE \
+&& tail -f $LOGFILE"]