Add Dockerfile & build pipeline

Dockerfile

@@ -0,0 +1,25 @@
+FROM golang:1.22.0-bookworm AS build
+
+# Create build workspace folder
+WORKDIR /workspace
+ADD . /workspace
+
+# Install updates and build tools
+RUN apt-get update --yes && \
+    apt-get install --yes build-essential
+
+# Build the actual binary
+RUN CGO_ENABLED=0 go build -o grafana-backuper main.go
+
+# -- -- -- -- -- --
+
+# Set up image to run the tool
+FROM alpine
+
+# Create main app folder to run from
+WORKDIR /app
+
+# Copy built binary from build image
+COPY --from=build /workspace/grafana-backuper /app
+
+ENTRYPOINT ["/app/grafana-backuper"]