Added add guide for cross compiling using docker

Add documentation for e.g. building arm64 as described in Spotifyd#1053

docs/src/installation/cross-compile-using-docker.md

@@ -0,0 +1,33 @@
+We can also use `docker` to cross compile on every platform and OS that runs `docker` and `qemu`:
+
+1. Setup a docker [custom builder](https://docs.docker.com/build/building/multi-platform/#create-a-custom-builder)
+```shell
+docker buildx create \
+  --name container-builder \
+  --driver docker-container \
+  --use --bootstrap
+```
+
+2. Create a docker `compose-file.yml`:
+```yaml
+services:
+  build-container:
+    image: rust:1.79-bookworm
+    platform: linux/arm64
+    command: bash -c "
+        apt-get update &&
+        apt-get install -y \
+          libasound2-dev \
+          libssl-dev \
+          pkg-config &&
+        curl -sSL https://api.github.com/repos/Spotifyd/spotifyd/tarball/v0.3.5 | tar xz -C /spotifyd --strip-components=1 &&
+        cargo build --release &&
+        cp /spotifyd/target/release/spotifyd /build/"
+    working_dir: /spotifyd
+    volumes:
+      - ./:/build
+```
+
+3. Run `docker compose up`
+
+This will copy the build `spotifyd` binary in the current directory.