Update runtimes workflow

Author: JeodC

.github/workflows/collect_runtimes.yml

@@ -4,6 +4,7 @@ on:
   push:
     paths:
       - 'runtimes/*.squashfs'
+      - 'runtimes/*.squashfs.md5'
   workflow_dispatch:
   workflow_run:
     # The push trigger above doesn't fire for pushes made by the default
@@ -47,6 +48,14 @@ jobs:
             LOCAL_SET[$(basename "$f")]=1
           done
 
+          for m in $(find runtimes -maxdepth 1 -name '*.squashfs.md5' -type f | sort); do
+            base=$(basename "$m" .md5)     # <name>.squashfs.md5 -> <name>.squashfs
+            if [ ! -f "runtimes/$base" ]; then
+              echo "Release-hosted runtime (marker only, exempt from purge): $base"
+              LOCAL_SET[$base]=1
+            fi
+          done
+
           # Snapshot remote assets (name → size, name → id)
           RELEASE_ID=$(gh api repos/${GITHUB_REPOSITORY}/releases/tags/runtimes-latest --jq '.id')
           declare -A REMOTE_SIZES REMOTE_IDS

buildtools/runtimes/mono/src/build.txt

@@ -0,0 +1,26 @@
+set -e
+
+# Mono runtime build courtesy [JohnnyOnFlame](https://gist.github.com/JohnnyonFlame/df7ba61a5559de293680789e7f01fbdc#file-bonus2_readme-md),
+# which produces the same runtime PortMaster hosts
+
+VERSION="${MONO_VERSION:-6.12.0.122}"
+ARCH=aarch64
+
+wget "https://download.mono-project.com/sources/mono/mono-${VERSION}.tar.xz"
+tar xf "mono-${VERSION}.tar.xz"
+cp Makefile.optm "mono-${VERSION}/Makefile.optm"
+cd "mono-${VERSION}"
+
+./autogen.sh \
+    --with-ikvm-native=no \
+    --with-csc=mcs \
+    --enable-llvm \
+    --disable-dependency-tracking \
+    --with-mcs-build \
+    --prefix="$(pwd)/built"
+make -j"$(nproc)"
+make install
+
+cd built
+PATH="$(pwd)/bin:$(pwd)/../llvm/usr/bin:$PATH" MONO_PATH="$(pwd)/lib/mono" \
+    make -f Makefile.optm -j"$(nproc)"

runtimes/mono-6.12.0.122-aarch64.squashfs.md5

@@ -0,0 +1 @@
+dc7145731bf17610c13c07d6e69de550