diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 0e500bab..d3855356 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -10,13 +10,16 @@ on:
 #  schedule:
 #    - cron: '30 11 20 */3 *'
 
-env:
-  REGISTRY_IMAGE: ghcr.io/${{ github.repository_owner }}/vs-fltk
-
 jobs:
   build-env-image:
     runs-on: ubuntu-24.04
     steps:
+      - name: set lower case owner name
+        run: |
+          echo "OWNER_LC=${OWNER,,}" >>${GITHUB_ENV}
+        env:
+          OWNER: '${{ github.repository_owner }}'
+          REGISTRY_IMAGE: ghcr.io/${{ env.OWNER }}/vs-fltk
       - name: Checkout
         uses: actions/checkout@v4
 
diff --git a/docker/.env.example b/docker/.env.example
new file mode 100644
index 00000000..6386f103
--- /dev/null
+++ b/docker/.env.example
@@ -0,0 +1,5 @@
+HOSTUID=1000
+HOSTGID=1000
+IMAGE="ghcr.io/karurochori/vs-fltk:build-env"
+ENTRYPOINT:$PWD/docker/default-entry.sh
+SOURCE_ROOT=$PWD
\ No newline at end of file
diff --git a/docker/README.md b/docker/README.md
index 4ad86142..a94d3635 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -8,7 +8,7 @@ file in /docker. The contents should be similar to:
 ```text
 HOSTUID=1000
 HOSTGID=1000
-IMAGE="ghcr.io/KaruroChori/vs-fltk:build-env"
+IMAGE="ghcr.io/karurochori/vs-fltk:build-env"
 ENTRYPOINT:$PWD/docker/default-entry.sh
 SOURCE_ROOT=$PWD
 ```
@@ -35,7 +35,7 @@ To run the image without using compose:
 docker run -it --rm -v \
   --entrypoint=$PWD/docker/default-entry.sh \
   -v $PWD:/workspace \
-  ghcr.io/KaruroChori/vs-fltk:build-env
+  ghcr.io/karurochori/vs-fltk:build-env
 ```
 -->
 
@@ -58,7 +58,7 @@ information about working with containers. You may, for example, want to
 
 You can pull the image manually:
 
-    docker pull ghcr.io/KaruroChori/vs-fltk:build-env
+    docker pull ghcr.io/karurochori/vs-fltk:build-env
 
 If you use `docker-compose` or `docker run ...` the image will be pulled
 automatically the first time.
diff --git a/docs/for-developers.md b/docs/for-developers.md
index 06bddb7d..e2560476 100644
--- a/docs/for-developers.md
+++ b/docs/for-developers.md
@@ -205,7 +205,7 @@ Log levels are:
 - **VERBOSE** to be emitted when running the program in verbose mode only
 - **DEBUG** to be emitted always when running a debug build or in debugging mode.
 
-Each messagge must specify their semantic type and log level (normal by default). Usually:
+Each message must specify their semantic type and log level (normal by default). Usually:
 
 - `panic` messages have a `silent` log level
 - `ok` and `continue` messages are usually `verbose`