INSTALL.md: notes from installing Plume

INSTALL.md

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+# How to install Plume on a Debian stretch:
+
+## Basic setup:
+apt update
+apt install gettext postgresql postgresql-contrib libpq-dev
+adduser plume
+su - plume
+cd /home/plume
+git clone https://github.com/Plume-org/Plume.git
+curl https://sh.rustup.rs -sSf | sh -s -- --no-modify-path --default-toolchain nightly
+cd Plume
+rustup toolchain install nightly
+rustup override set nightly-2018-05-15 # this seems to be needed for compilation
+cargo install diesel_cli --no-default-features --features postgres # we dont need to compile anything else than pgsql
+
+## Now, if you want to run postgresql on the same server:
+cargo run # this will configure and launch Plume on the server.
+
+## If you want to run Plume with a remote DB this time ( Postgresql is not installed on the same server/container):
+* On the DB server:
+su - postgres
+createuser -d -P plume
+createdb -O plume plume
+
+* On the Plume server:
+diesel migration run --database-url postgres://plume:PASSWORD@DBSERVERIP:DBPORT/plume
+DB_URL=postgres://plume:PASSWORD@DBSERVERIP:DBPORT/plume cargo run # the first launch will ask questions to configure the instance. A second launch will not need the DB_URL.