add release script and roll-back to ubuntu-20.04 runners

.github/workflows/build.yaml

@@ -11,7 +11,7 @@ permissions:
 
 jobs:
   build-publish:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4

.github/workflows/test.yaml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   test:
-    runs-on: Ubuntu 22.04	
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v4

internal/scripts/helm-release.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+# Build and release helm chart if the version does not already exists in the specified AWS ECR public repository
+
+CHART_NAME=$1
+CHART_DIRECTORY=$2
+RELEASE_VERSION=$3
+REPOSITORY=$4
+
+usage() {
+    echo "Usage: $0 <chart_name> <chart_directory> <release_version> <AWS_ECR_public_repository>"
+    exit 1
+}
+
+check_parameters() {
+    if [ -z $CHART_NAME ];
+    then
+        echo "ERROR: Chart name must be specified"
+        usage
+    fi
+
+    if [ -z $CHART_DIRECTORY ];
+    then
+        echo "ERROR: Chart directory must be specified"
+        usage
+    fi
+
+    if [ -z $RELEASE_VERSION ];
+    then
+        echo "ERROR: Release version must be specified"
+        usage
+    fi
+
+    if [ -z $REPOSITORY ];
+    then
+        echo "ERROR: Repository must be specified"
+        usage
+    fi
+}
+
+check_version_exists() {
+    AWS_ERROR=$(aws ecr-public describe-images --region us-east-1 --repository-name ${CHART_NAME} --image-ids imageTag=${RELEASE_VERSION} --output json 2>&1 > /dev/null)
+    AWS_EXIT_CODE=$?
+    if [ $AWS_EXIT_CODE -eq 0 ];
+    then
+        echo "Release ${RELEASE_VERSION} already exists in AWS ECR"
+        exit 0
+    elif [ ! $AWS_EXIT_CODE -eq 254 ];
+    then
+        echo "Unexpected error while checking if ${RELEASE_VERSION} version exists: exit code ${AWS_EXIT_CODE}"
+        echo ${AWS_ERROR}
+        exit 1
+    fi
+}
+
+build() {
+    helm package ${CHART_DIRECTORY} --app-version ${RELEASE_VERSION} --version ${RELEASE_VERSION}
+}
+
+publish() {
+    helm push ${CHART_NAME}-${RELEASE_VERSION}.tgz oci://public.ecr.aws/${REPOSITORY}
+}
+
+check_parameters
+check_version_exists
+
+set -x
+
+build
+publish