How to Deploy a Go service to GCP Cloud Run

// cmd/main.go
func main() {
 flag.Parse()

 a := app.Application{}

 if err := a.LoadConfigurations(); err != nil {
        log.Fatalf("Failed to load configurations: %v", err)
    }

    if err := runtime.Start(&a); err != nil {
        log.Fatalf("Failed to start the application: %v", err)
    }

}

func Start(a *app.Application) error {
    router := gin.New()

    router.Use(cors.New(md.CORSMiddleware()))

    api.SetCache(router, a.RedisClient)
    api.SetRoutes(router, a.FireClient, a.FireAuth, a.RedisClient)

    err := router.Run(":" + a.ListenPort)
    log.Printf("Starting server on port: %s", a.ListenPort)
    if err != nil {
        return err
    }

    return nil
}

# Use the official Go image as the base image
FROM golang:1.18

WORKDIR /app

# Copy the Go module files
COPY go.mod go.sum ./

RUN go mod download

# Copy the rest of the application code
COPY . .

RUN go build -o main  ./cmd/main.go

CMD ["./main"]

// env-variables.sh
#!/bin/bash

# Environment variables
export PROJECT_ID=recepies-6e7c0
export REGION=europe-west1

export REDIS_URL="rediss://default:AVrvA....-lemur-23279.u....:6379"
export FIREBASE_ACCOUNT_KEY="/app/config/account_key.json"
export CLIENT_URL="https://.....vercel.app/"

#!/bin/bash

source env-variables.sh

#Comment if correctly deployed
docker build -t gcr.io/$PROJECT_ID/recipe-server:latest .
docker push gcr.io/$PROJECT_ID/recipe-server:latest

#Uncomment if json needs to be added to GCP 
# gcloud secrets create firebase-account-key --data-file=/mnt/c/own_dev/RecipesApp/server/config/account_key.json --project=recepies-6e7c0

#Add permission IAM
gcloud projects add-iam-policy-binding recepies-6e7c0 \
    --member="serviceAccount:service-988443547488@serverless-robot-prod.iam.gserviceaccount.com" \
    --role="roles/artifactregistry.reader"

gcloud run deploy recipe-service \
  --image gcr.io/$PROJECT_ID/recipe-server:latest \
  --region $REGION \
  --platform managed \
  --set-env-vars REDIS_URL=$REDIS_URL,CLIENT_URL=$CLIENT_URL,FIREBASE_ACCOUNT_KEY=$FIREBASE_ACCOUNT_KEY

a9099c3159f5: Layer already exists
latest: digest: sha256:8c98063cd5b383df0b444c5747bb729ffd17014d42b049526b8760a4b09e5df1 size: 2846
Deploying container to Cloud Run service [recipe-service] in project [recepies-6e7c0] region [europe-west1]
✓ Deploying... Done.
  ✓ Creating Revision...
  ✓ Routing traffic...
Done.
Service [recipe-service] revision [recipe-service-00024-5mh] has been deployed and is serving 100 percent of traffic.
Service URL: https://recipe-service-819621241045.europe-west1.run.app

Deploying container to Cloud Run service [recipe-service] in project [recepies-6e7c0] region [europe-west1] X Deploying… - Creating Revision… . Routing traffic… Deployment failed ERROR: 
(gcloud.run.deploy) Revision 'recipe-service-00005-b6h' 
is not ready and cannot serve traffic. Google Cloud Run Service Agent service-819621241045@serverless-robot-prod.iam.gserviceaccount.com must have permission to read the image, 
gcr.io/loyal-venture-436807-p7/recipe-server:latest. Ensure that the provided container image URL is correct and that the above account has permission to access the image. If you just enabled the Cloud Run API, the permissions might take a few minutes to propagate. Note that the image is from project [loyal-venture-436807-p7], which is not the same as this project [recepies-6e7c0]. Permission must be granted to the Google Cloud Run Service 
Agent service-819621241045@serverless-robot-prod.iam.gserviceaccount.com from this project. See https://cloud.google.com/run/docs/deploying#other-projects