Add drone + build motsognir

Signed-off-by: Christian Richter <crichter@owncloud.com>

.drone.star

@@ -1,38 +1,82 @@
 def main(ctx):
-  return [
-    step("amd64"),
-    step("arm64"),
-  ]
+    return [
+        stepPR("amd64"),
+        stepPR("arm64"),
+        stepMergeMaster("amd64"),
+        stepMergeMaster("arm64"),
+    ]
 
-def step(arch):
-  return {
-    "kind": "pipeline",
-    "type": "docker",
-    "name": "docker-%s" % (arch),
-    "platform": {
+
+def stepPR(arch):
+    return {
+        "kind":
+        "pipeline",
+        "type":
+        "docker",
+        "name":
+        "docker-%s" % (arch),
+        "platform": {
             "os": "linux",
             "arch": arch,
         },
-    "steps": [
-      {
-      "name": "build-image-%s" % (arch),
-      "image": "plugins/docker",
-      "settings": {
-          "dockerfile": "motsognir/Dockerfile",
-          "repo": "dragonchaser/motsognir",
-          "tag": "latest-%s" % (arch),
-          "username": {
-            "from_secret":"dockerhub-user"
-          },
-          "password": {
-            "from_secret":"dockerhub-password"
-          }
-        }
-      },
-    ],
-    "trigger": {
-      "ref": [
-        "refs/pull/**",
-      ],
-    },
-  }
+        "steps": [
+            {
+                "name": "build-and-push-image-%s" % (arch),
+                "image": "plugins/docker",
+                "settings": {
+                    "dockerfile": "motsognir/Dockerfile",
+                    "repo": "dragonchaser/motsognir",
+                    "dry_run": "true",
+                    "tag": "latest-%s" % (arch),
+                    "username": {
+                        "from_secret": "dockerhub-user"
+                    },
+                    "password": {
+                        "from_secret": "dockerhub-password"
+                    }
+                }
+            },
+        ],
+        "trigger": {
+            "ref": [
+                "refs/pull/**",
+            ],
+        },
+    }
+
+def stepMergeMaster(arch):
+    return {
+        "kind":
+        "pipeline",
+        "type":
+        "docker",
+        "name":
+        "docker-%s" % (arch),
+        "platform": {
+            "os": "linux",
+            "arch": arch,
+        },
+        "steps": [
+            {
+                "name": "build-image-%s" % (arch),
+                "image": "plugins/docker",
+                "settings": {
+                    "dockerfile": "motsognir/Dockerfile",
+                    "repo": "dragonchaser/motsognir",
+                    "dry_run": "true",
+                    "tag": "latest-%s" % (arch),
+                    "username": {
+                        "from_secret": "dockerhub-user"
+                    },
+                    "password": {
+                        "from_secret": "dockerhub-password"
+                    }
+                }
+            },
+        ],
+        "trigger": {
+            "ref": [
+                "refs/heads/master",
+            ],
+        },
+    }