Try cookiecutter

{{ cookiecutter.project_slug }}/test/.env

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+HASS_USERNAME=dev
+HASS_PASSWORD=dev
+LOVELACE_LOCAL_FILES={{ cookiecutter.project_file }}.js
+LOVELACE_PLUGINS="thomasloven/lovelace-card-mod"

{{ cookiecutter.project_slug }}/test/configuration.yaml

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+default_config:
+
+demo:
+
+lovelace:
+  mode: storage
+  dashboards:
+    lovelace-yaml:
+      mode: yaml
+      title: yaml
+      filename: test/lovelace.yaml

{{ cookiecutter.project_slug }}/test/docker-compose.yml

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+version: "3.0"
+
+services:
+  test:
+    image: thomasloven/hass-custom-devcontainer
+    environment:
+      - HASS_USERNAME
+      - HASS_PASSWORD
+      - LOVELACE_LOCAL_FILES
+      - LOVELACE_PLUGINS
+    volumes:
+      - ./configuration.yaml:/config/configuration.yaml:ro
+      - .:/config/test:ro
+      - ..:/config/www/workspace
+      - ../custom_components,target=/config/custom_components
+    ports:
+      - 8125:8123