feat: allow using a custom directory for CA certificates (#78)

Instead of using a hardcoded PATH for the custom CA certificates, this
patch allows the user to select a different one.

This will be useful for plugin-barman-cloud, that will directly inject
the certificates in the pod using a projected volume.

Signed-off-by: Leonardo Cecchi <leonardo.cecchi@enteprisedb.com>
Co-authored-by: Leonardo Cecchi <leonardo.cecchi@enteprisedb.com>

Author: leonardoce

pkg/credentials/env.go

@@ -65,13 +65,8 @@ func EnvSetBackupCloudCredentials(
 	configuration *barmanApi.BarmanObjectStoreConfiguration,
 	env []string,
 ) ([]string, error) {
-	if configuration.EndpointCA != nil && configuration.BarmanCredentials.AWS != nil {
-		env = append(env, fmt.Sprintf("AWS_CA_BUNDLE=%s", BarmanBackupEndpointCACertificateLocation))
-	} else if configuration.EndpointCA != nil && configuration.BarmanCredentials.Azure != nil {
-		env = append(env, fmt.Sprintf("REQUESTS_CA_BUNDLE=%s", BarmanBackupEndpointCACertificateLocation))
-	}
-
-	return envSetCloudCredentials(ctx, c, namespace, configuration, env)
+	return EnvSetCloudCredentialsAndCertificates(
+		ctx, c, namespace, configuration, env, BarmanBackupEndpointCACertificateLocation)
 }
 
 // EnvSetRestoreCloudCredentials sets the AWS environment variables needed for restores
@@ -82,11 +77,26 @@ func EnvSetRestoreCloudCredentials(
 	namespace string,
 	configuration *barmanApi.BarmanObjectStoreConfiguration,
 	env []string,
+) ([]string, error) {
+	return EnvSetCloudCredentialsAndCertificates(
+		ctx, c, namespace, configuration, env, BarmanRestoreEndpointCACertificateLocation)
+}
+
+// EnvSetCloudCredentialsAndCertificates sets the AWS and Azure
+// environment variables needed for restores given the configuration
+// inside the cluster
+func EnvSetCloudCredentialsAndCertificates(
+	ctx context.Context,
+	c client.Client,
+	namespace string,
+	configuration *barmanApi.BarmanObjectStoreConfiguration,
+	env []string,
+	certificatesLocation string,
 ) ([]string, error) {
 	if configuration.EndpointCA != nil && configuration.BarmanCredentials.AWS != nil {
-		env = append(env, fmt.Sprintf("AWS_CA_BUNDLE=%s", BarmanRestoreEndpointCACertificateLocation))
+		env = append(env, fmt.Sprintf("AWS_CA_BUNDLE=%s", certificatesLocation))
 	} else if configuration.EndpointCA != nil && configuration.BarmanCredentials.Azure != nil {
-		env = append(env, fmt.Sprintf("REQUESTS_CA_BUNDLE=%s", BarmanRestoreEndpointCACertificateLocation))
+		env = append(env, fmt.Sprintf("REQUESTS_CA_BUNDLE=%s", certificatesLocation))
 	}
 	return envSetCloudCredentials(ctx, c, namespace, configuration, env)
 }