add workflow to build

Dockerfile

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+# Stage 1: Build Go binary
+FROM golang:1.26-alpine AS builder
+
+RUN apk add --no-cache git ca-certificates
+
+WORKDIR /build
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -o ytdlp-navidrome .
+
+# Stage 2: Install yt-dlp and ffmpeg
+FROM alpine:latest AS tools
+
+RUN apk add --no-cache \
+    python3 \
+    py3-pip \
+    ffmpeg \
+    ca-certificates
+
+RUN pip3 install --break-system-packages yt-dlp
+
+# Stage 3: Final image
+FROM alpine:latest
+
+RUN apk add --no-cache \
+    ca-certificates \
+    ffmpeg \
+    python3 \
+    libc6-compat
+
+# Copy Python + packages from tools stage
+COPY --from=tools /usr/lib/python3.12 /usr/lib/python3.12
+COPY --from=tools /usr/bin/yt-dlp /usr/bin/yt-dlp
+COPY --from=tools /usr/bin/ffmpeg /usr/bin/ffmpeg
+COPY --from=tools /usr/bin/ffprobe /usr/bin/ffprobe
+
+# Copy Go binary
+COPY --from=builder /build/ytdlp-navidrome /usr/local/bin/ytdlp-navidrome
+
+# Create directories
+RUN mkdir -p /music/ytdlp /tmp/ytdlp-previews
+
+ENTRYPOINT ["/usr/local/bin/ytdlp-navidrome"]