fix: build without CGO

Dockerfile

@@ -20,7 +20,7 @@ RUN apk update && \
 COPY . .
 
 RUN go mod download
-RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /app
+RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags="-w -s" -o /app
 
 FROM scratch
 
@@ -31,4 +31,4 @@ ENTRYPOINT ["/app"]
 COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=build /etc/passwd /etc/passwd
 COPY --from=build /etc/group /etc/group
-COPY --from=build /app /app
+COPY --from=build /app /app

README.md

@@ -54,13 +54,13 @@ spec:
           protocol: TCP
           name: metrics
         securityContext:
+          readOnlyRootFilesystem: true
           allowPrivilegeEscalation: false
           privileged: false
           capabilities:
             drop:
               - ALL
       securityContext:
-        readOnlyRootFilesystem: true
         runAsNonRoot: true
         runAsUser: 10001
 ```
@@ -87,7 +87,6 @@ kind: ServiceMonitor
 apiVersion: monitoring.coreos.com/v1
 metadata:
   name: freshping-exporter
-  namespace: monitor
   labels:
     app.kubernetes.io/name: freshping-exporter
 spec: