✨ Add a Dockerfile

Dockerfile

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+# Copyright 2024 Florian Beisel
+# 
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Start from a base image with Go installed and C libraries needed for SQLite.
+FROM golang:1.21-bookworm as builder
+
+# Set the working directory.
+WORKDIR /app
+
+# Copy the go.mod and go.sum files first and download the modules. 
+# This is to take advantage of Docker's cache layers.
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the rest of the source code.
+COPY . .
+
+# Build the binary. CGO is enabled by default in the official Go images.
+RUN go build -o app .
+
+# Use Debian as the base for the runtime image as it includes necessary C libraries.
+FROM debian:bookworm-slim
+
+# Set the working directory in the container.
+WORKDIR /root/
+
+# Copy the binary from the builder stage.
+COPY --from=builder /app/app .
+
+# Copy the binary from the builder stage.
+COPY --from=builder /app/db/migrations db/migrations
+
+# Add any runtime dependencies here, if needed.
+
+# Command to run the executable.
+CMD ["./app"]