ci: update submodules in a separate step

also, tweak step dependency graph a little

.drone.yml

@@ -12,8 +12,17 @@ trigger:
   event: [push, pull_request]
 
 steps:
+  - name: submodules
+    pull: always
+    depends_on: [clone]
+    image: alpine/git
+    commands:
+      - git --version
+      - git submodule update --init --recursive
+
   - name: pull fedora-hugo
     pull: always
+    depends_on: [clone]
     image: immawanderer/fedora-hugo:linux-amd64
     commands:
       - uname -r
@@ -21,12 +30,11 @@ steps:
 
   - name: hugo-extended
     pull: if-not-exists
-    depends-on:
+    depends_on:
+      - submodules
       - pull fedora-hugo
     image: immawanderer/fedora-hugo:linux-amd64
     commands:
-      - git submodule init
-      - git submodule update
       - hugo version
       - hugo --gc=true --minify
 
@@ -57,6 +65,14 @@ depends_on:
   - build
 
 steps:
+  - name: submodules
+    pull: always
+    depends_on: [clone]
+    image: alpine/git
+    commands:
+      - git --version
+      - git submodule update --init --recursive
+
   - name: pull fedora-hugo
     pull: always
     depends_on: [clone]
@@ -75,13 +91,11 @@ steps:
 
   - name: hugo-extended
     pull: if-not-exists
-    depends-on:
+    depends_on:
+      - submodules
       - pull fedora-hugo
-      - pull tmaier/docker-compose
     image: immawanderer/fedora-hugo:linux-amd64
     commands:
-      - git submodule init
-      - git submodule update
       - hugo version
       - hugo --gc=true --minify
 
@@ -97,6 +111,7 @@ steps:
     pull: always
     image: tmaier/docker-compose:latest
     depends_on:
+      - pull tmaier/docker-compose
       - rm-intermediate
     volumes:
       - name: s