Cache repository to speed up CI runtime

.woodpecker.yml

@@ -2,18 +2,26 @@ clone:
   git:
     image: bash
     commands:
-      - git clone --recursive https://git.exozy.me/Ta180m/howtuwu.git
+      - mkdir -p /var/lib/woodpecker-agent/Ta180m
+      - cd /var/lib/woodpecker-agent/Ta180m
+      - if [ -d howtuwu ]; then
+      -   cd howtuwu
+      -   git pull
+      -   git submodule update
+      - else
+      -   git clone --recursive https://git.exozy.me/Ta180m/howtuwu.git
+      - fi
 
 pipeline:
   build-theme:
     image: bash
     commands:
-      - cd howtuwu/themes/hugo-geekdoc
+      - cd /var/lib/woodpecker-agent/Ta180m/howtuwu/themes/hugo-geekdoc
       - npm install
       - npm run build
 
   build:
     image: bash
     commands:
-      - cd howtuwu
+      - cd /var/lib/woodpecker-agent/Ta180m/howtuwu
       - hugo --minify --destination /srv/http/pages/howtuwu