add build arguments to compose

README.md

@@ -52,6 +52,16 @@ You can set environmental values in `.env` file
 
 ### Environment
 
+#### Build arguments
+
+- `ALPINE_VERSION` - alpine linux docker image tag
+- `NOVNC_VERSION` - version of noVNC. [Releases page](https://github.com/novnc/noVNC/releases)
+- `WEBSOCKIFY_VERSION` - Version of Websockify. [Releases page](https://github.com/novnc/websockify/releases)
+- `IMAGE_TAG` - name of building image tag
+- `BUILD_DATE` - date of building image
+
+#### Runtime environmental variables
+
 - `ALPINE_PASSWORD` - change password for user `alpine`
 - `PUBLIC_HTTP_PORT` - set port for access to novnc.
   `16080:6080` would publish novnc on `16080` port.

docker-compose.yml

@@ -4,11 +4,11 @@ services:
     build:
       context: .
       args:
-        ALPINE_VERSION: "3.19"
+        ALPINE_VERSION: "${ALPINE_VERSION:-3.19}"
-        NOVNC_VERSION: "v1.4.0"
+        NOVNC_VERSION: "${NOVNC_VERSION:-v1.4.0}"
-        WEBSOCKIFY_VERSION: "v0.11.0"
+        WEBSOCKIFY_VERSION: "${WEBSOCKIFY_VERSION:-v0.11.0}"
-        IMAGE_TAG: "latest"
+        IMAGE_TAG: "${IMAGE_TAG:-latest}"
-        BUILD_DATE: "01.01.1970"
+        BUILD_DATE: "${BUILD_DATE:-01.01.1970}"
     ports:
       - '${PUBLIC_HTTP_PORT:-6080:6080}'
     restart: always