add local snapshot to repo; add Dockerfile; update docker-compose.yml;

Dockerfile

@@ -0,0 +1,22 @@
+# Use the official Golang image to create a build artifact.
+FROM golang:1.25
+
+# Set the Current Working Directory inside the container
+WORKDIR /app
+
+# Copy go mod and sum files
+COPY go.mod go.sum ./
+#COPY .env ./
+COPY describegraph.json /app/describegraph.json
+
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
+RUN go mod tidy
+
+# Copy the source from the current directory to the Working Directory inside the container
+COPY . .
+
+# Build the Go app
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o lnstream .
+
+# Command to run the executable
+CMD ["./lnstream"]