docker: add redis instance

docker/redis/Dockerfile

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+FROM redis:7.4-alpine
+
+RUN mkdir -p /var/run/redis && chmod 777 /var/run/redis
+COPY ./docker/redis/redis.conf /etc/redis.conf
+
+ENTRYPOINT [ "docker-entrypoint.sh", "/etc/redis.conf" ]

docker/redis/redis.conf

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+# Accept connections on the specified port, default is 6379 (IANA #815344).
+# If port 0 is specified Redis will not listen on a TCP socket.
+#port 6379
+port 0
+
+# Unix socket.
+#
+# Specify the path for the Unix socket that will be used to listen for
+# incoming connections. There is no default, so Redis will not listen
+# on a unix socket when not specified.
+#
+unixsocket /var/run/redis/redis-server.sock
+# Executig a socket is a no-op, and we need to share acces to other programs.
+# Shared the connection only with programs in the redis group for security.
+#unixsocketperm 700
+unixsocketperm 666