ci: use Jsonnet for YAML configuration generation

Because the two kinds of pipelines were very similar, I used Jsonnet to
factorise the definitions.

This means I have to switch the configuration file in my settings, and
enable Jsonnet files.

.drone.jsonnet

@@ -0,0 +1,45 @@
+local Pipeline(isDev) = {
+  kind: "pipeline",
+  name: if isDev then "deploy-dev" else "deploy-prod",
+  # Dev ignores "master", prod only triggers on "master"
+  trigger: { branch: { [if isDev then "exclude" else "include"]: [ "master" ] } },
+  # We want to clone the submodules, which isn't done by default
+  clone: { disable: true },
+  steps: [
+    {
+      name: "clone",
+      image: "plugins/git",
+      recursive: true,
+    },
+    {
+      name: "build",
+      image: "klakegg/hugo",
+      commands: [
+        "hugo version",
+        # If dev, include drafts and future articles, change base URL
+        "hugo --minify" + if isDev then " -D -F -b https://dev.belanyi.fr" else "",
+      ],
+      [if !isDev then "environment"]: { HUGO_ENV: "production" }
+    },
+    {
+      name: "deploy",
+      image: "appleboy/drone-scp",
+      settings: {
+        source: "public/*",
+        strip_components: 1, # Remove 'public/' suffix from file paths
+        rm: true, # Remove previous files from target directory
+        host: { from_secret: "ssh_host" },
+        target: { from_secret: "ssh_target" + if isDev then "_dev" else "" },
+        username: { from_secret: "ssh_user" },
+        key: { from_secret: "ssh_key" },
+        port: { from_secret: "ssh_port" },
+      },
+    },
+  ]
+};
+
+
+[
+  Pipeline(false),
+  Pipeline(true),
+]

.drone.yml

@@ -1,76 +0,0 @@
-kind: pipeline
-name: default
-
-clone:
-  disable: true
-
-
-steps:
-  - name: clone
-    image: plugins/git
-    recursive: true
-
-  # Production build and deploy
-  - name: build
-    image: klakegg/hugo
-    commands:
-      - hugo version
-      - hugo --minify
-    environment:
-      HUGO_ENV: production
-    when:
-      branch:
-        - master
-
-  - name: deploy
-    image: appleboy/drone-scp
-    settings:
-      source: public/*
-      strip_components: 1 # Make sure the tarball doesn't contain leading path
-      rm: true # Make sure only the newly generated files are left
-      host:
-        from_secret: ssh_host
-      target:
-        from_secret: ssh_target
-      username:
-        from_secret: ssh_user
-      key:
-        from_secret: ssh_key
-      port:
-        from_secret: ssh_port
-    when:
-      branch:
-        - master
-
-  # Dev build and deploy
-  - name: build-dev
-    image: klakegg/hugo
-    commands:
-      - hugo version
-      # Include drafts and future articles, use dev base url
-      - hugo --minify -D -F -b https://dev.belanyi.fr
-    when:
-      branch:
-        exclude:
-          - master
-
-  - name: deploy-dev
-    image: appleboy/drone-scp
-    settings:
-      source: public/*
-      strip_components: 1 # Make sure the tarball doesn't contain leading path
-      rm: true # Make sure only the newly generated files are left
-      host:
-        from_secret: ssh_host
-      target:
-        from_secret: ssh_target_dev
-      username:
-        from_secret: ssh_user
-      key:
-        from_secret: ssh_key
-      port:
-        from_secret: ssh_port
-    when:
-      branch:
-        exclude:
-          - master