Remove the Dockerfile and GitHub actions workflow.

.github/workflows/docker.yml

@@ -1,71 +0,0 @@
-name: Docker
-
-# Thanks to Ryan Govostes <https://github.com/rgov> for this workflow.
-
-# Using 'if:' conditions, the script will not execute the steps
-# unless it is running out of the 'mikebrady/shairport-sync' GitHub repository.
-
-on:
-  push:
-    # Publish `master` as Docker `latest` image.
-    branches:
-      - master
-
-    # Publish `1.2.3` tags as releases.
-    tags:
-      - '*'
-
-env:
-  IMAGE_NAME: mikebrady/shairport-sync
-#  DOCKER_PLATFORMS: linux/386,linux/amd64,linux/arm/v6,linux/arm/v7,linux/arm64
-  DOCKER_PLATFORMS: linux/386,linux/amd64,linux/arm/v6,linux/arm64
-  DOCKER_HUB_USER: mikebrady
-
-jobs:
-  # Build the container image for multiple architectures
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-      # This unusual setup is due to limitations with `docker buildx`. 
-      # See: https://github.com/crazy-max/ghaction-docker-buildx/issues/134
-      - name: Prepare
-        id: prepare
-        if: github.repository == 'mikebrady/shairport-sync'
-        run: |
-          # Map git ref branch or tag name to Docker tag version
-          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
-          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
-          [ "$VERSION" == "master" ] && VERSION=latest && SHAIRPORT_SYNC_BRANCH=master
-          
-          # If tagged with a version, build the same version of Shairport Sync
-          [ "$VERSION" != "latest" ] && SHAIRPORT_SYNC_BRANCH=tags/$VERSION
-
-          # Output build arguments for downstream steps
-          echo ::set-output name=buildx_args::\
-            --platform ${DOCKER_PLATFORMS} \
-            --build-arg SHAIRPORT_SYNC_BRANCH=${SHAIRPORT_SYNC_BRANCH} \
-            --tag ${IMAGE_NAME}:${VERSION} \
-            .
-
-      - uses: actions/checkout@v2
-      - uses: crazy-max/ghaction-docker-buildx@v1.2.1
-
-      - name: Build
-        if: github.repository == 'mikebrady/shairport-sync'
-        run: |
-          docker buildx build \
-            --output type=image,push=false \
-            ${{ steps.prepare.outputs.buildx_args }}
-
-      - name: Log into registry
-        if: github.event_name == 'push' && github.repository == 'mikebrady/shairport-sync'
-        run: echo "${{ secrets.DOCKER_HUB_TOKEN }}" | docker login --username $DOCKER_HUB_USER --password-stdin
-
-      - name: Push to registry
-        if: github.event_name == 'push' && github.repository == 'mikebrady/shairport-sync'
-        run: |
-          docker buildx build \
-            --output type=image,push=true \
-            ${{ steps.prepare.outputs.buildx_args }}
-