first commit

.github/workflows/build-container.yml

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+name: Build and Push Docker image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ghcr.io/${{ github.repository }}/nodered-ffmpeg:3.1.9

Dockerfile

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+# Use a specific version of the Node-RED base image
+FROM nodered/node-red:3.1.9
+
+# Install FFmpeg
+USER root
+RUN apk update && apk add --no-cache ffmpeg
+USER node-red