Change .drone.yml in favor of more compact .drone.jsonnet

Include debian & archlinux in tests

.drone.jsonnet

@@ -0,0 +1,50 @@
+local AptPipeline(image, version, compiler) = {
+  kind: "pipeline",
+  type: "docker",
+  name: image+"-"+version+"-"+compiler,
+  steps: [
+    {
+      name: "build",
+      image: image+":"+version,
+      commands: [
+        "apt update",
+        "DEBIAN_FRONTEND=noninteractive apt install -y make "+compiler,
+        "make clean",
+        "make CC="+compiler+" CFLAGS=\"-Wall -Werror -Wno-unknown-warning-option -Wno-unknown-pragmas -Wno-packed-bitfield-compat\""
+      ]
+    }
+  ]
+};
+
+local PacManPipeline(image, version, compiler) = {
+  kind: "pipeline",
+  type: "docker",
+  name: image+"-"+version+"-"+compiler,
+  steps: [
+    {
+      name: "build",
+      image: image+":"+version,
+      commands: [
+        "pacman -Syy",
+        "pacman --noconfirm -S make "+compiler,
+        "make clean",
+        "make CC="+compiler+" CFLAGS=\"-Wall -Werror -Wno-unknown-warning-option -Wno-unknown-pragmas -Wno-packed-bitfield-compat\""
+      ]
+    }
+  ]
+};
+
+[
+  AptPipeline("ubuntu", "20.04", "gcc"),
+  AptPipeline("ubuntu", "20.04", "clang"),
+  AptPipeline("ubuntu", "18.04", "gcc"),
+  AptPipeline("ubuntu", "18.04", "clang"),
+
+  AptPipeline("debian", "buster", "gcc"),
+  AptPipeline("debian", "buster", "clang"),
+  AptPipeline("debian", "stretch", "gcc"),
+  AptPipeline("debian", "stretch", "clang"),
+
+  PacManPipeline("archlinux", "latest", "gcc"),
+  PacManPipeline("archlinux", "latest", "clang")
+]

.drone.yml

@@ -1,27 +0,0 @@
----
-kind: pipeline
-type: docker
-name: build-gcc
-
-steps:
-  - name: build
-    image: ubuntu:20.04
-    commands:
-      - apt update
-      - DEBIAN_FRONTEND=noninteractive apt install -y gcc make
-      - make clean
-      - make CC=gcc CFLAGS="-Wall -Werror -Wno-unknown-warning-option -Wno-packed-bitfield-compat"
----
-kind: pipeline
-type: docker
-name: build-clang
-
-steps:
-  - name: build
-    image: ubuntu:20.04
-    commands:
-      - apt update
-      - DEBIAN_FRONTEND=noninteractive apt install -y clang make
-      - make clean
-      - make CC=clang CFLAGS="-Wall -Werror -Wno-unknown-warning-option -Wno-packed-bitfield-compat"
-...