Add scripts to save and restore baseline data

script/ci/restore-staging-baseline.sh

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+#!/bin/bash
+
+# Restore baseline data for staging in case a pull request messed with
+# the database.
+
+set -e
+
+# Load default values if not already set.
+: ${DB_USER='ofn_user'}
+: ${DB_DATABASE='openfoodnetwork'}
+
+srcdir="$HOME/apps/openfoodnetwork/shared"
+srcfile="$srcdir/staging-baseline.sql.gz"
+
+if [ -f "$srcfile" ]; then
+	echo "Restoring data from: $srcfile"
+else
+	>&2 echo "[Error] No baseline data available at: $srcfile"
+	exit 1
+fi
+
+# We want to re-create the database but it's still in use.
+# The SQL query below is a workaround suppoting old postgresql versions.
+#
+# Once we have at least Postgresql 13, we can replace these SQL commands with:
+#
+#   DROP DATABASE IF EXISTS $DB_DATABASE WITH FORCE
+#   CREATE DATABASE $DB_DATABASE
+#
+# Versions:
+# - Ubuntu 16: psql 9.5
+# - Ubuntu 18: psql 10
+# - Ubuntu 20: psql 15 <-- switch here
+psql -h localhost -U "$DB_USER" postgres <<EOF
+REVOKE CONNECT ON DATABASE $DB_DATABASE FROM public;
+ALTER DATABASE $DB_DATABASE CONNECTION LIMIT 0;
+SELECT pg_terminate_backend(pid)
+FROM pg_stat_activity
+WHERE pid <> pg_backend_pid()
+AND datname='$DB_DATABASE';
+DROP DATABASE $DB_DATABASE;
+CREATE DATABASE $DB_DATABASE;
+EOF
+
+gunzip -c "$srcfile" | psql -h localhost -U "$DB_USER" "$DB_DATABASE"
+echo "Staging baseline data restored."

script/ci/save-staging-baseline.sh

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+#!/bin/bash
+
+# Save baseline data for staging which can be restored in case a pull request
+# messes with the database.
+
+set -e
+
+# Load default values if not already set.
+: ${DB_USER='ofn_user'}
+: ${DB_DATABASE='openfoodnetwork'}
+
+dstdir="$HOME/apps/openfoodnetwork/shared"
+dstfile="$dstdir/staging-baseline.sql.gz"
+
+mkdir -p "$dstdir"
+pg_dump -h localhost -U "$DB_USER" "$DB_DATABASE" | gzip > "$dstfile"
+echo "Staging baseline data saved."