chore: add env_file: stack.env to all compose services

Portainer git-stack deployments require an explicit env_file reference
in the compose file to load variables from the repo's stack.env.
Adds env_file: [stack.env] before every service-level environment:
block across all 10 stacks.

stacks/foundry/docker-compose.yml

@@ -14,6 +14,8 @@ services:
       - /storage1/foundry:/data
       - /storage1/foundry/updatemain.bash:/home/foundry/updatemain.bash
       - /storage1/Books/Tabletop:/data/Data/storage
+    env_file:
+      - stack.env
     environment:
       - FOUNDRY_USERNAME=${FOUNDRY_USERNAME}
       - FOUNDRY_PASSWORD=${FOUNDRY_PASSWORD}
@@ -40,6 +42,8 @@ services:
       - /storage1/foundry2:/data
       - /storage1/foundry/updatemain.bash:/home/foundry/updatemain.bash
       - /storage1/Books/Tabletop:/data/Data/storage
+    env_file:
+      - stack.env
     environment:
       - FOUNDRY_USERNAME=${FOUNDRY_USERNAME}
       - FOUNDRY_PASSWORD=${FOUNDRY_PASSWORD}