Add very basic Makefile and GitHub Actions Workflow

.github/workflows/root.yml

@@ -0,0 +1,26 @@
+name: Execute ROOT macros
+on:
+  push:
+    branches: 'main'
+  pull_request:
+
+jobs:
+  root-v634:
+    name: ROOT 6.34
+    runs-on: ubuntu-latest
+    container: rootproject/root:6.34.00-ubuntu24.04
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+      - name: Execute ROOT macros
+        run: make
+      - name: Upload produced RNTuple ROOT files
+        uses: actions/upload-artifact@v4
+        with:
+          name: RNTuple-ROOT
+          path: "*.root"
+      - name: Upload produced validation JSON files
+        uses: actions/upload-artifact@v4
+        with:
+          name: Validation-JSON
+          path: "*.json"

Makefile

@@ -0,0 +1,21 @@
+ROOT_EXE := $(shell which root.exe)
+ifeq ($(ROOT_EXE),)
+$(error Could not find root.exe)
+endif
+
+.PHONY: all
+all:
+	$(MAKE) write
+	$(MAKE) read
+
+# This assumes there is no whitespace in any of the paths...
+WRITE_C := $(sort $(shell find . -name write.C))
+READ_C := $(sort $(shell find . -name read.C))
+
+.PHONY: write
+write:
+	@$(foreach c,$(WRITE_C),$(ROOT_EXE) -q -l $(c) &&) true
+
+.PHONY: read
+read:
+	@$(foreach c,$(READ_C),$(ROOT_EXE) -q -l $(c) &&) true