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+# Source: https://oneuptime.com/blog/post/2026-01-07-go-hot-reloading-docker-air/view#step-3-create-the-development-dockerfile
+
+# Dockerfile (Development)
+# This Dockerfile is optimized for development with hot reloading
+# It includes Air and mounts your source code as a volume
+
+# Use the official Go image as our base
+# Alpine variant is smaller but we use the full image for better compatibility
+FROM golang:1.26-bookworm
+
+# Set the working directory inside the container
+# All subsequent commands will run from this directory
+WORKDIR /app
+
+# Shared modules (git.dcntrlized.org/dcntrlized/dcntrlized-auth) are served by
+# the dev Gitea Go module proxy. Override via --build-arg in production.
+ARG GOPROXY_VALUE=http://192.168.122.183:3000/api/packages/Dcntrlized/go
+ARG GONOSUMDB_VALUE=git.dcntrlized.org
+ENV GOPROXY=${GOPROXY_VALUE},https://proxy.golang.org,direct
+ENV GONOSUMDB=${GONOSUMDB_VALUE}
+
+# Install Air for hot reloading
+# We install it globally so it's available in the PATH
+RUN go install github.com/air-verse/air@latest
+
+# Install additional development tools (optional but useful)
+# - delve: Go debugger for debugging inside containers
+# - golangci-lint: Linter for code quality checks
+RUN go install github.com/go-delve/delve/cmd/dlv@latest && \
+    curl -sSfL https://golangci-lint.run/install.sh | sh -s -- -b $(go env GOPATH)/bin v2.11.2
+
+# Copy go.mod and go.sum first for better layer caching
+# This layer only rebuilds when dependencies change
+COPY src/go.mod src/go.sum* ./
+
+# Download all dependencies
+# This is cached separately from source code changes
+RUN go mod download && go mod verify
+
+# Copy the Air configuration file
+# This tells Air how to watch and rebuild our application
+COPY ./src/.air.toml ./
+
+# Note: We do NOT copy source code here!
+# Source code is mounted as a volume in Docker Compose
+# This enables hot reloading without rebuilding the image
+
+# Expose the application port
+# Make sure this matches your application's listening port
+EXPOSE 8080
+
+# Expose delve debugger port (optional, for debugging)
+EXPOSE 2345
+
+# Set environment variables for development
+ENV GO111MODULE=on
+
+# Default command: run Air for hot reloading
+# Air will watch for changes and rebuild automatically
+CMD ["air", "-c", ".air.toml"]
+
+##
+
+ARG IMAGE_VERSION=dev
+ARG IMAGE_REVISION=
+
+LABEL org.dcntrlized.service=Alarm
+LABEL org.dcntrlized.port=8080
+LABEL org.opencontainers.image.version=$IMAGE_VERSION
+LABEL org.opencontainers.image.revision=$IMAGE_REVISION