moves the build process to Dockerfile

package/Dockerfile

@@ -1,4 +1,22 @@
-FROM registry.suse.com/bci/bci-micro:15.6
+FROM golang:1.22.0 as build
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+
+ENV CGO_ENABLED=0
+
+RUN VERSION=$(git describe --tags --always) \
+    ARCH=$(go env GOARCH) \
+    SUFFIX="-${ARCH}" \
+    LINKFLAGS="-X github.com/rancher/csp-adapter.Version=$VERSION" && \
+    go build -ldflags "$LINKFLAGS -extldflags -static -s" -o bin/csp-adapter
+
+FROM registry.suse.com/bci/bci-micro:15.6 as final
 
 ARG user=adapter
 
@@ -7,7 +25,7 @@ RUN echo "$user:x:1000:1000::/home/$user:/bin/bash" >> /etc/passwd && \
     mkdir /home/$user && \
     chown -R $user:$user /home/$user
 
-COPY bin/csp-adapter /usr/bin/
+COPY --from=build /app/bin/csp-adapter /usr/bin/
 
 USER $user