[DO-1088] Add pod template for flatpak build (#32)

Reviewed-on: https://git.avroid.tech/DevOps/jenkins-shared-lib/pulls/32
Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Co-committed-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>

vars/getPodTemplate.groovy

@@ -255,6 +255,31 @@ Object tavroLinuxTemplateQT_5_15 = """
     - name: ${env.JENKINS_K8S_HARBOR_SECRET}
 """
 
+Object flatpakTemplate = """
+  apiVersion: v1
+  kind: Pod
+  spec:
+    containers:
+    - name: linux
+      image: ${env.JENKINS_DOCKER_REGISTRY}/all/all-flatpak-build:org-kde-5-15-23-04
+      securityContext:
+        runAsUser: 1000
+        runAsGroup: 1000
+      command:
+      - sleep
+      args:
+      - 99d
+      resources:
+        limits:
+          cpu: 15
+          memory: 32Gi
+        requests:
+          cpu: 15
+          memory: 32Gi
+    imagePullSecrets:
+    - name: ${env.JENKINS_K8S_HARBOR_SECRET}
+"""
+
     switch (podTemplateName) {
         case 'alpine':
             return alpineTemplate
@@ -274,5 +299,7 @@ Object tavroLinuxTemplateQT_5_15 = """
             return tavroLinuxTemplate
         case 'tavroLinux_qt_5_15':
             return tavroLinuxTemplateQT_5_15
+        case 'flatpak':
+            return flatpakTemplate
     }
 }