client: add custom compose merge file functionality

Like custom build functionality (custom Dockerfile), adds support for
custom docker-compose.yml functionality:
  * Adds default custom compose file
  * Adds to run-time environment
  * Adds to `gen` and `edit`

client/conf.d/client/Dockerfiles/dev-tools/docker-compose.yml.dev-tools.in

@@ -0,0 +1,32 @@
+# docker-finance | modern accounting for the power-user
+#
+# Copyright (C) 2021-2024,2026 Aaron Fiore (Founder, Evergreen Crypto LLC)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+# docker-finance @DOCKER_FINANCE_VERSION@
+
+## This is a custom compose file that will be *merged* with the base compose file
+## See https://docs.docker.com/compose/how-tos/multiple-compose-files/merge/ for details
+
+## An example of adding a custom volume and environment variables
+## NOTE: *MUST* also add these variables to the env file (`edit type=env`)
+#services:
+#  docker-finance:
+#    volumes:
+#      - ${DOCKER_FINANCE_CLIENT_TESTING}:${DOCKER_FINANCE_CONTAINER_TESTING}
+#    environment:
+#      - DOCKER_FINANCE_CONTAINER_TESTING=${DOCKER_FINANCE_CONTAINER_TESTING}
+
+# vim: sw=2 sts=2 si ai et

client/conf.d/client/Dockerfiles/finance/docker-compose.yml.archlinux.in

@@ -0,0 +1,32 @@
+# docker-finance | modern accounting for the power-user
+#
+# Copyright (C) 2021-2024,2026 Aaron Fiore (Founder, Evergreen Crypto LLC)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+# docker-finance @DOCKER_FINANCE_VERSION@
+
+## This is a custom compose file that will be *merged* with the base compose file
+## See https://docs.docker.com/compose/how-tos/multiple-compose-files/merge/ for details
+
+## An example of adding a custom volume and environment variables
+## NOTE: *MUST* also add these variables to the env file (`edit type=env`)
+#services:
+#  docker-finance:
+#    volumes:
+#      - ${DOCKER_FINANCE_CLIENT_TESTING}:${DOCKER_FINANCE_CONTAINER_TESTING}
+#    environment:
+#      - DOCKER_FINANCE_CONTAINER_TESTING=${DOCKER_FINANCE_CONTAINER_TESTING}
+
+# vim: sw=2 sts=2 si ai et

client/conf.d/client/Dockerfiles/finance/docker-compose.yml.ubuntu.in

@@ -0,0 +1,32 @@
+# docker-finance | modern accounting for the power-user
+#
+# Copyright (C) 2021-2024,2026 Aaron Fiore (Founder, Evergreen Crypto LLC)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+# docker-finance @DOCKER_FINANCE_VERSION@
+
+## This is a custom compose file that will be *merged* with the base compose file
+## See https://docs.docker.com/compose/how-tos/multiple-compose-files/merge/ for details
+
+## An example of adding a custom volume and environment variables
+## NOTE: *MUST* also add these variables to the env file (`edit type=env`)
+#services:
+#  docker-finance:
+#    volumes:
+#      - ${DOCKER_FINANCE_CLIENT_TESTING}:${DOCKER_FINANCE_CONTAINER_TESTING}
+#    environment:
+#      - DOCKER_FINANCE_CONTAINER_TESTING=${DOCKER_FINANCE_CONTAINER_TESTING}
+
+# vim: sw=2 sts=2 si ai et