Add Dockerfile for building and running the application

Dockerfile

@@ -0,0 +1,14 @@
+FROM golang:1.23.1-alpine3.21
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY migrations ./migrations
+COPY static ./static
+COPY templates ./templates
+COPY *.go ./
+RUN go build -o /pcinv
+
+RUN /pcinv --install
+CMD ["/pcinv"]