Update docker.io/postgres Docker tag to v18

.gitea/workflows/render-manifests-automerge.yaml

@@ -72,7 +72,6 @@ jobs:
             echo "$GIT_DIFF"
             for path in $GIT_DIFF; do
               RENDER_DIR+=$(echo "$path" | awk -F '/' '{print $4}')
-              RENDER_DIR+=$(echo " ")
             done
 
           else

.gitea/workflows/render-manifests-merge.yaml

@@ -77,7 +77,6 @@ jobs:
             echo "$GIT_DIFF"
             for path in $GIT_DIFF; do
               RENDER_DIR+=$(echo "$path" | awk -F '/' '{print $4}')
-              RENDER_DIR+=$(echo " ")
             done
 
           else

.gitea/workflows/render-manifests-push.yaml

@@ -75,7 +75,6 @@ jobs:
             echo "$GIT_DIFF"
             for path in $GIT_DIFF; do
               RENDER_DIR+=$(echo "$path" | awk -F '/' '{print $4}')
-              RENDER_DIR+=$(echo " ")
             done
 
           else