refactor: remove AX_DB_PATH env var, fix Dockerfile for src/ layout

Dockerfile

@@ -4,12 +4,13 @@ WORKDIR /app
 
 ENV GOTOOLCHAIN=auto
 
-COPY go.mod go.sum ./
+COPY src/go.mod src/go.sum ./
 RUN go mod download
 
-COPY . ./
+COPY src/ ./
 
-RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -o /ax .
+RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH \
+    go build -ldflags="-s -w" -trimpath -o /ax .
 
 FROM alpine:latest
 
@@ -17,10 +18,8 @@ RUN apk --no-cache add ca-certificates
 
 WORKDIR /data
 
-COPY --from=builder /ax /app/ax
-
-ENV AX_DB_PATH=/data/.ax.db
+COPY --from=builder /ax /usr/local/bin/ax
 
 EXPOSE 7000
 
-ENTRYPOINT ["/app/ax", "serve"]
+ENTRYPOINT ["ax"]