separate github actions based on OS

This fixes #466.

.github/workflows/ci-alpine-linux.yml

@@ -0,0 +1,26 @@
+name: ci_alpine_linux
+
+on: [push, pull_request]
+
+jobs:
+
+  gcc-musl:
+    runs-on: ubuntu-latest
+    container: alpine:latest
+    steps:
+      - name: install deps
+        run: >-
+          apk --no-cache add \
+            build-base \
+            meson \
+            pkgconf \
+            linux-pam \
+            linux-pam-dev
+      - name: checkout
+        uses: actions/checkout@v2
+      - run: meson setup builddir/
+        env:
+          CC: gcc
+      - run: ninja -C builddir
+        env:
+          CC: gcc

.github/workflows/ci-ubuntu.yml

@@ -0,0 +1,32 @@
+name: ci_ubuntu
+
+on: [push, pull_request]
+
+jobs:
+
+  gcc-glibc:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: sudo apt-get update -q
+    - run: sudo apt-get install -q -y build-essential libpam-dev meson
+    - run: meson setup builddir/
+      env:
+        CC: gcc
+    - run: ninja -C builddir
+      env:
+        CC: gcc
+
+
+  clang-glibc:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - run: sudo apt-get update -q
+    - run: sudo apt-get install -q -y build-essential clang libpam-dev meson
+    - run: meson setup builddir/
+      env:
+        CC: clang
+    - run: ninja -C builddir
+      env:
+        CC: clang

.github/workflows/ci_meson.yml

@@ -1,55 +0,0 @@
-# Nabbed from https://github.com/mesonbuild/meson/blob/master/docs/markdown/Continuous-Integration.md#github-actions
-name: ci_meson
-
-on: [push, pull_request]
-
-jobs:
-
-  linux-gcc-glibc-ubuntu:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - run: sudo apt-get update -q
-    - run: sudo apt-get install -q -y build-essential libpam-dev meson
-    - run: meson setup builddir/
-      env:
-        CC: gcc
-    - run: ninja -C builddir
-      env:
-        CC: gcc
-
-
-  linux-clang-glibc-ubuntu:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - run: sudo apt-get update -q
-    - run: sudo apt-get install -q -y build-essential clang libpam-dev meson
-    - run: meson setup builddir/
-      env:
-        CC: clang
-    - run: ninja -C builddir
-      env:
-        CC: clang
-
-
-  linux-gcc-alpine-musl:
-    runs-on: ubuntu-latest
-    container: alpine:latest
-    steps:
-      - name: install deps
-        run: >-
-          apk --no-cache add \
-            build-base \
-            meson \
-            pkgconf \
-            linux-pam \
-            linux-pam-dev
-      - name: checkout
-        uses: actions/checkout@v2
-      - run: meson setup builddir/
-        env:
-          CC: gcc
-      - run: ninja -C builddir
-        env:
-          CC: gcc