Add Docker documentation in DOCKER_MORE_CLOSELY.md

DOCKER_MORE_CLOSELY.md

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+# Docker More Closely
+
+## Apple M1 Platform
+
+***Attention:** For using Docker commands in Apple M1 environments!*
+
+### Enviroment Variable For Apple M1 Platform
+
+To set the Docker platform environment variable in your terminal tab, run:
+
+```bash
+# set env variable for your shell
+$ export DOCKER_DEFAULT_PLATFORM=linux/amd64
+```
+
+### Docker Compose Override File For Apple M1 Platform
+
+For Docker compose `up` or `build` commands, you can use our Apple M1 override file that specifies the M1 platform:
+
+```bash
+# in main folder
+
+# for development
+$ docker compose -f docker-compose.yml -f docker-compose.override.yml -f docker-compose.apple-m1.override.yml up
+
+# for production
+$ docker compose -f docker-compose.yml -f docker-compose.apple-m1.override.yml up
+```
+
+## Analysing Docker Builds
+
+To analyze a Docker build, there is a wonderful tool called [dive](https://github.com/wagoodman/dive). Please sponsor if you're using it!
+
+The `dive build` command is exactly the right one to fulfill what we are looking for.
+We can use it just like the `docker build` command and get an analysis afterwards.
+
+So, in our main folder, we use it in the following way:
+
+```bash
+# in main folder
+$ dive build --target <layer-name> -t "gradido/<app-name>:local-<layer-name>" <app-folder-name-or-dot>/
+```
+
+For the specific applications, see our [publish.yml](.github/workflows/publish.yml).