Bump Plex build on cron and attempt to push to git

This should cover 95% of cases where we'd want to bump Plex, but
autonomously. If the build fails or the tests fail we'll know about it
and can manually investigate.

Signed-off-by: Joe Groocock <me@frebib.net>

.drone.yml

@@ -2,6 +2,12 @@
 kind: pipeline
 name: build-amd64
 
+trigger:
+  event:
+  - push
+  - pull_request
+  - tag
+
 platform:
   os: linux
   arch: amd64
@@ -50,8 +56,36 @@ steps:
     event:
     - push
 
+---
+kind: pipeline
+name: update-cron
+
+trigger:
+  event:
+  - cron
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: update
+  pull: always
+  image: spritsail/alpine
+  commands:
+  - apk add bash curl jq git
+  - ./update.sh
+
+- name: push
+  pull: always
+  image: appleboy/drone-git-push
+  settings:
+    branch: pass
+    remote: git@github.com:spritsail/plex-media-server.git
+    ssh_key: {from_secret: git_ssh_key}
+
 ---
 kind: signature
-hmac: 9ccac4af6a5a1f3849f3593741c44df1564956093fc038f628fa500973969b43
+hmac: 21c718e301b4ad099b8a7c6cd9f0021e5fd86fcbd3ba14a16184a40eca155fd0
 
 ...

update.sh

@@ -11,13 +11,16 @@ sed -Ei \
     Dockerfile
 
 if ! git diff --quiet --exit-code Dockerfile; then
+    export GIT_COMMITTER_NAME="Spritsail Bot"
+    export GIT_COMMITTER_EMAIL="<bot@spritsail.io>"
+    export GIT_AUTHOR_NAME="$GIT_COMMITTER_NAME"
+    export GIT_AUTHOR_EMAIL="$GIT_COMMITTER_EMAIL"
     git reset --soft
     git add -- Dockerfile
     git commit \
-        --author="Spritsail Bot <bot@spritsail.io>" \
         --no-gpg-sign \
+        --signoff \
         -m "Update to Plex ${VERSION%-*}"
-    git push origin HEAD
 else
     >&2 echo No update available
 fi