ci: package plugin binary in docker container (#99)

Signed-off-by: Kostis Kapelonis <kostis@codefresh.io>

Author: kostis-codefresh

Dockerfile

@@ -0,0 +1,18 @@
+FROM --platform=$BUILDPLATFORM golang:1.22.5 AS builder
+
+ENV GO111MODULE=on
+ARG TARGETARCH
+
+WORKDIR /app
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -ldflags "-s -w" -o rollouts-plugin-trafficrouter-gatewayapi .
+
+FROM alpine:3.19.0
+
+ARG TARGETARCH
+
+USER 999
+
+COPY --from=builder /app/rollouts-plugin-trafficrouter-gatewayapi /bin/