Add recipes for use with Native-CI's C/C++/meson and addtional Android NDK images

C/meson-android.yml

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+# Image: https://coderberg.org/native-ci/android-ndk
+#
+# See meson.yml - the main difference is that this uses a different image that
+# includes an Android NDK installation as well as cross compilation profiles
+# for the NDK's platforms.
+#
+# The cross compilation files for meson includes a `sys_root` property that you
+# may need to pass on to the compiler.
+pipeline:
+  build:
+    image: codeberg.org/native-ci/android-ndk:latest
+    # this step gets ran on "master" and "dev" branch.
+    # also runs on pull requests targeting these branch.
+    when:
+      branch: [ master, dev ]
+    commands: |
+      # Possible profiles:
+      #   android-arm64-v8a.txt
+      #   android-armeabi-v7a.txt
+      #   android-x86_64.txt
+      #   android-x86.txt
+      mkdir build && cd build
+      meson --cross-file android-arm64-v8a.txt ..
+      ninja -v

C/meson.yml

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+# Image: https://coderberg.org/native-ci/cpp-meson
+#
+# Meson (https://www.mesonbuild.com) provides builds for C, C++, etc.
+# It typically generates ninja (https://ninja-build.org/) files.
+#
+# As native code dependencies may need to be installed via Conan
+# (https://conan.io/), it is also included in the image (usage
+# not in this example).
+#
+# Includes GCC and clang
+pipeline:
+  build:
+    image: codeberg.org/native-ci/cpp-meson:latest
+    # this step gets ran on "master" and "dev" branch.
+    # also runs on pull requests targeting these branch.
+    when:
+      branch: [ master, dev ]
+    commands: |
+      mkdir build && cd build
+      meson ..
+      ninja -v