Create user "diffy" and use it for all operations.

diffy/Dockerfile

@@ -0,0 +1,9 @@
+### Add "diffy" user to the container.
+ARG BASE_IMAGE
+FROM $BASE_IMAGE
+SHELL ["/bin/bash", "-c"]
+
+ARG username
+ARG uid
+ARG gid
+RUN (groupadd --gid $gid "$username" || groupadd "$username" || true) && (useradd  -l -m -s "/bin/bash" --gid "$username" --comment '' --uid $uid "$username" || useradd  -l -m -s "/bin/bash" --gid "$username" --comment '' "$username" || useradd  -l -m -s "/bin/bash" --gid "$gid" --comment '' "$username" || useradd -l -m -s "/bin/bash" --comment '' $username )

docker-compose.diffy.yaml

@@ -3,6 +3,14 @@ services:
   diffy:
     container_name: ddev-${DDEV_SITENAME}-diffy
     image: diffywebsite2/screenshot-worker:0.0.1
+    user: '$DDEV_UID:$DDEV_GID'
+    build:
+      context: 'diffy'
+      args:
+        BASE_IMAGE: diffywebsite2/screenshot-worker:0.0.1
+        username: "diffy"
+        uid: ${DDEV_UID}
+        gid: ${DDEV_GID}
     command: tail -f /dev/null
     restart: "no"
     # These labels ensure this service is discoverable by ddev.

install.yaml

@@ -46,6 +46,7 @@ project_files:
 - docker-compose.diffy.yaml
 - commands/diffy/screenshot
 - config.diffy.yaml
+- diffy/Dockerfile
 
 # List of files and directories that are copied into the global .ddev directory
 # DDEV environment variables can be interpolated into these filenames
@@ -95,6 +96,7 @@ removal_actions:
   - rm -rf commands/diffy
   - rm -rf diffy-worker-main
   - rm config.diffy.yaml
+  - rm -rf diffy
 
 # Advanced usage - yaml files can be read in and then used as go template actions
 # in pre_install_actions and post_install_actions