Dockerfile update to use Go as builder

.github/workflows/pull-build-image-autobumper.yaml

@@ -3,8 +3,8 @@ on:
   pull_request_target:
     types: [ opened, edited, synchronize, reopened, ready_for_review ]
     paths:
-      - "cmd/image-syncer/*.go"
-      - "cmd/image-syncer/Dockerfile"
+      - 'cmd/image-autobumper/Dockerfile'
+      - 'cmd/image-autobumper/**'
       - "go.mod"
       - "go.sum"
 

.github/workflows/push-build-image-autobumper.yaml

@@ -4,8 +4,8 @@ on:
     branches:
       - main
     paths:
-      - 'cmd/image-detector/Dockerfile'
-      - 'cmd/image-detector/**'
+      - 'cmd/image-autobumper/Dockerfile'
+      - 'cmd/image-autobumper/**'
       - 'go.mod'
       - 'go.sum'
   workflow_dispatch: {}
@@ -14,7 +14,7 @@ jobs:
   build-image:
     uses: ./.github/workflows/image-builder.yml
     with:
-      name: image-detector
+      name: image-autobumper
       dockerfile: cmd/image-autobumper/Dockerfile
       context: .
   print-image:

cmd/image-autobumper/Dockerfile

@@ -1,13 +1,27 @@
-FROM europe-docker.pkg.dev/kyma-project/prod/testimages/alpine-git:v20240924-6fb36f45
+FROM golang:1.23-alpine as builder
 
 WORKDIR /app
 
 COPY go.mod go.sum ./
 
+# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
 RUN go mod download
 
+# Copy the source to the Working Directory inside the container
 COPY . .
 
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o image-autobumper ./cmd/image-autobumper
+WORKDIR /app/cmd/image-autobumper
 
-ENTRYPOINT ["./image-autobumper"]
+# Build the Go app with static linking
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main .
+
+FROM alpine:3.20.3
+
+LABEL io.kyma-project.source=github.com/kyma-project/test-infra/cmd/image-autobumper
+
+# Copy the built Go app from the builder stage
+COPY --from=builder /app/cmd/image-autobumper/main /image-autobumper
+
+RUN apk add --no-cache ca-certificates git && \
+    chmod +x /image-autobumper
+ENTRYPOINT ["/image-autobumper"]