K8SPG-738: Add startup log to print commit hash, branch and build time (#1109)

Co-authored-by: Viacheslav Sarzhan <[email protected]>

Author: egegunes

build/postgres-operator/Dockerfile

@@ -27,11 +27,11 @@ RUN mkdir -p build/_output/bin \
         apt-get update -y && apt-get install gcc-x86-64-linux-gnu -y && export CC=x86_64-linux-gnu-gcc; \
       fi \
    && CGO_ENABLED=$OPERATOR_CGO_ENABLED GOARCH=${TARGETARCH} GOOS=$GOOS GO_LDFLAGS=$GO_LDFLAGS \
-       go build -ldflags "-w -s -X main.GitCommit=$GIT_COMMIT -X main.GitBranch=$GIT_BRANCH" \
+       go build -ldflags "-w -s -X main.GitCommit=$GIT_COMMIT -X main.GitBranch=$GIT_BRANCH -X main.BuildTime=$BUILD_TIME" \
            -o build/_output/bin/postgres-operator \
                ./cmd/postgres-operator \
     && CGO_ENABLED=$EXTENSION_INSTALLER_CGO_ENABLED GOARCH=${TARGETARCH} GOOS=$GOOS GO_LDFLAGS=$GO_LDFLAGS \
-       go build -ldflags "-w -s -X main.GitCommit=$GIT_COMMIT -X main.GitBranch=$GIT_BRANCH" \
+       go build -ldflags "-w -s -X main.GitCommit=$GIT_COMMIT -X main.GitBranch=$GIT_BRANCH -X main.BuildTime=$BUILD_TIME" \
            -o build/_output/bin/extension-installer \
                ./cmd/extension-installer \
     && cp -r build/_output/bin/postgres-operator /usr/local/bin/postgres-operator \

cmd/postgres-operator/main.go

@@ -8,6 +8,7 @@ import (
 	"context"
 	"fmt"
 	"os"
+	goruntime "runtime"
 	"strconv"
 	"strings"
 	"time"
@@ -47,7 +48,12 @@ import (
 	"github.com/percona/percona-postgresql-operator/pkg/apis/postgres-operator.crunchydata.com/v1beta1"
 )
 
-var versionString string
+var (
+	GitCommit     string
+	GitBranch     string
+	BuildTime     string
+	versionString string
+)
 
 // assertNoError panics when err is not nil.
 func assertNoError(err error) {
@@ -74,6 +80,9 @@ func main() {
 	log := logging.FromContext(ctx)
 	log.V(1).Info("debug flag set to true")
 
+	log.Info("Manager starting up", "gitCommit", GitCommit, "gitBranch", GitBranch,
+		"buildTime", BuildTime, "goVersion", goruntime.Version(), "os", goruntime.GOOS, "arch", goruntime.GOARCH)
+
 	features := feature.NewGate()
 	err = features.SetFromMap(map[string]bool{
 		string(feature.InstanceSidecars):  true, // needed for PMM