Add GH Actions workflow

.github/workflows/release.yml

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+name: Generate release files
+
+permissions:
+  contents: write
+on:
+  push:
+    tags:
+      - "Release_**"
+  workflow_dispatch:
+
+jobs:
+  make_software:
+    runs-on: ubuntu-latest
+    container: liv2/amiga-gcc-amitools
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Build
+        run: make software package
+
+      - uses: actions/upload-artifact@master
+        with:
+          name: software
+          path: artifacts/*
+
+  draft_release:
+    runs-on: ubuntu-latest
+    needs:
+      - make_software
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - uses: actions/download-artifact@v3
+        with:
+          path: artifacts
+      - name: release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          files: |
+            artifacts/software/**/*

.gitignore

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+artifacts/
+tmp/

Makefile

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+SHELL:=/bin/bash
+CURDIR:=$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))
+TMPDIR=$(CURDIR)/tmp/
+ARTIFACTDIR:=$(CURDIR)/artifacts
+
+.PHONY: all software clean
+
+software:
+	$(MAKE) -C bootrom all
+	$(MAKE) -C addram all
+	$(MAKE) -C cflash all
+#	$(MAKE) -C iderom all
+
+clean:
+	$(MAKE) -C bootrom clean
+	$(MAKE) -C addram clean
+	$(MAKE) -C cflash clean
+#	$(MAKE) -C iderom clean
+	rm -rf $(ARTIFACTDIR)
+	rm -rf $(TMPDIR)
+
+package: addram/addram bootrom/bootrom cflash/cflash
+	rm -rf $(TMPDIR)
+	mkdir -p $(TMPDIR)
+	mkdir -p $(ARTIFACTDIR)
+	cp $^ $(TMPDIR)
+	cd $(TMPDIR) && xdftool $(ARTIFACTDIR)/CIDER-Software.adf format CIDER $(addprefix + write ,$(notdir $^))
+	cd $(TMPDIR) && lha -c $(ARTIFACTDIR)/CIDER-Software.lha $(notdir $^)