More CI fixes, testing in prod :D

.drone.yml

@@ -9,4 +9,4 @@ steps:
     commands:
       - apk add tree libxslt libxml2-utils
       - apk add pandoc --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing/
-      - sh ./build.sh
+      - ./build.sh

build.sh

@@ -7,7 +7,7 @@ tree_file=$(mktemp "/tmp/$USER.XXXXXXXXXX")
 trap "rm \"$include_after\" \"$tree_output\" \"$tree_file\"" EXIT
 
 # Preprocess include-after.html
-sed "s/{{ now }}/$(date --iso-8601=seconds)/g;s/{{ generator }}/$(pandoc --version | head -n1)/g" include-after.html > "$include_after"
+sed "s/{{ now }}/$(date -Iseconds)/g;s/{{ generator }}/$(pandoc --version | head -n1)/g" include-after.html > "$include_after"
 
 function convert {
 	pandoc \