Add nightly build action that uses Earthly. Another step in #1953

.github/workflows/docker-nightly-earthly.yaml

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+# See https://docs.earthly.dev/ci-integration/vendor-specific-guides/gh-actions-integration
+# for details.
+
+name: Build nightly docker
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 2 * * *'
+
+jobs:
+  Docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download latest earthly
+        run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.6.14/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
+
+      - name: Earthly version
+        run: earthly --version
+
+      - name: Log into GitHub Container Registry
+        env:
+          GH_CR_PAT: ${{ secrets.GH_CR_PAT }}
+        run: echo "${{ secrets.GH_CR_PAT }}" | docker login https://ghcr.io -u ${{ github.actor }} --password-stdin
+        if: env.GH_CR_PAT != null
+
+      - uses: actions/checkout@v3
+      - name: Checkout and build
+        if: env.GH_CR_PAT != null
+        env:
+          GH_CR_PAT: ${{ secrets.GH_CR_PAT }}
+        run: |
+          branch=""
+          if [ -n "$GITHUB_HEAD_REF" ]; then
+            branch="$GITHUB_HEAD_REF"
+          else
+            branch="${GITHUB_REF##*/}"
+          fi
+          git checkout -b "$branch" || true
+          cd build/release && ./docker-nightly-earthly.sh

build/release/docker-nightly-earthly.sh

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+#!/bin/sh
+
+# Docker build
+# Must authenticate first: https://docs.github.com/en/packages/using-github-packages-with-your-projects-ecosystem/configuring-docker-for-use-with-github-packages#authenticating-to-github-packages
+DOCKER_IMAGE="owncast-earthly"
+DATE=$(date +"%Y%m%d")
+VERSION="${DATE}-nightly"
+
+echo "Building Docker image ${DOCKER_IMAGE}..."
+
+earthly --ci --push +docker --image="ghcr.io/owncast/${DOCKER_IMAGE}" --tag=nightly --version=${VERSION}
+
+# docker push ghcr.io/owncast/${DOCKER_IMAGE}:nightly