Dockerfile.backend

ARG GO_VERSION=1.19.4
FROM golang:${GO_VERSION}-alpine3.17 AS builder

### Install gcc in order to be able to use CGO later
RUN apk add --no-cache build-base

### Copy Go code, copying required folders only (use .dockerignore)
WORKDIR /src/
COPY . .

### Build executables and strip debug symbols
# Use the "netgo" tag to resolve DNS queries in Go directly
RUN CGO_ENABLED=1 \
	go build  \
    	-tags netgo  \
    	-mod=vendor  \
    	-ldflags '-extldflags "-static"' \
    	-a \
    	-o /app/webapi \
    	./cmd/webapi \
    && strip /app/*

### Create final container from scratch
FROM alpine:3.17

### Inform Docker about which port is used
EXPOSE 3000

### Create and use the "appuser" standard user
RUN adduser \
	--home /app/ \
	--disabled-password \
	--shell /bin/false \
	 appuser
USER appuser

### Copy the build executable from the builder image
WORKDIR /app/
COPY --from=builder --chown=appuser:appuser /app/* ./

### Executable command
ENV CFG_WEB_API_HOST='0.0.0.0:3000'
ENV CFG_LOG_DEBUG=false
ENV CFG_DB_FILENAME='/tmp/wasaphoto.db'
ENV CFG_USER_CONTENT_FS_DIR='/tmp/static/user_content'
CMD ["/app/webapi"]