chore: add arm64 build support to Docker workflow

* Update beta-build.yml

* Update release-build.yml

* docs: update README to include compatibility information

---------

Co-authored-by: Marvin Haschker <123marvin123@users.noreply.github.com>
Co-authored-by: Sam Chau <chaucted@gmail.com>

.github/workflows/release-build.yml

@@ -16,6 +16,11 @@ jobs:
               id: tag
               run: echo "tag=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
 
+            - name: Set up QEMU
+              uses: docker/setup-qemu-action@v3
+              with:
+                platforms: linux/amd64,linux/arm64/v8
+
             - name: Set up Node.js
               uses: actions/setup-node@v4
               with:
@@ -47,6 +52,7 @@ jobs:
               uses: docker/build-push-action@v5
               with:
                   context: .
+                  platforms: linux/amd64,linux/arm64/v8
                   push: true
                   tags: |
                       santiagosayshey/profilarr:latest