Create docker-build-on-formal-release.yaml

diff --git a/.github/workflows/docker-build-on-formal-release.yaml b/.github/workflows/docker-build-on-formal-release.yaml
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+# Builds & pushes a docker image when a "formal" release tag of the format X, X.Y or X.Y.Z occurs, where X, Y and Z are all numbers.
+# It seems this yaml has to exist on the branch the tag refers to.
+
+# Thanks to Charles Omer for the workfow upon which this is based.
+
+# The following docker tags are created & pushed:
+# trial, trial-classic
+# not building 'latest' yet...
+
+name: Formal (X, X.Y or X.Y.Z) release tags -- docker build and push.
+
+on:
+  push:
+    branches: [ master ]
+      tags:
+        - '[0-9]+.[0-9]+.[0-9]+'  # e.g. 8.9.0
+        - '[0-9]+.[0-9]+'  # e.g. 8.9
+        - '[0-9]+'  # e.g. 8
+
+env:
+  DOCKER_PLATFORMS: linux/386,linux/amd64,linux/arm/v6,linux/arm64,linux/arm/v7
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set SHAIRPORT_SYNC_BRANCH env.
+        run: |
+          raw=$(git branch -r --contains ${{ github.ref }})
+          branch=${raw##*/}
+          echo "SHAIRPORT_SYNC_BRANCH=${branch}" >> $GITHUB_ENV
+
+      - name: Set tag env
+        run: echo "GIT_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Determine NQPTP env (part 1).
+        if: ${{ env.SHAIRPORT_SYNC_BRANCH == 'development' }}
+        run: echo "NQPTP_BRANCH=development" >> $GITHUB_ENV
+      
+      - name: Determine NQPTP env (part 2).
+        if: ${{ env.SHAIRPORT_SYNC_BRANCH != 'development' }}
+        run: echo "NQPTP_BRANCH=main" >> $GITHUB_ENV
+        
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to Docker Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ${{ secrets.DOCKER_REGISTRY }}
+          username: ${{ secrets.DOCKER_REGISTRY_USER }}
+          password: ${{ secrets.DOCKER_REGISTRY_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./docker/Dockerfile
+          platforms: ${{ env.DOCKER_PLATFORMS }}
+          push: true
+          tags: trial
+          build-args: |
+            SHAIRPORT_SYNC_BRANCH=${{ env.SHAIRPORT_SYNC_BRANCH }}
+            NQPTP_BRANCH=${{ env.NQPTP_BRANCH }}
+
+      - name: Build and push (Classic)
+        uses: docker/build-push-action@v2
+        with:
+          context: ./
+          file: ./docker/classic/Dockerfile
+          platforms: ${{ env.DOCKER_PLATFORMS }}
+          push: true
+          tags: trial-classic
+          build-args: |
+            SHAIRPORT_SYNC_BRANCH=${{ env.SHAIRPORT_SYNC_BRANCH }}