init: first init

Dockerfile

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+FROM golang:1.26-alpine AS builder
+
+# Set workdir
+WORKDIR /lib/autocal
+
+# Copy go modules
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy rest of source code
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /lib/autocal/app .
+
+# Final stage
+FROM alpine:latest
+
+RUN addgroup -S autocal_group && adduser -S autocal_user -G autocal_group
+USER autocal_user
+
+WORKDIR /lib/autocal
+
+COPY --from=builder /lib/autocal/app .
+COPY --from=builder /lib/autocal/credentials.json .
+
+EXPOSE 4444
+
+ENTRYPOINT ["/lib/autocal/app"]