refactor: modernise RPM builder with Python tooling v2

- Migrate from legacy shell-based build system to modern Python tooling
- Update all metadata.yaml files to new schema with per-distro builds
- Standardise build scripts with curl -L, envsubst, and error handling
- Convert nfpm.yaml templates to use environment variable substitution
- Update Dockerfile to accept all package metadata as build arguments
- Modernise Makefile to use new Python build tool commands
- Update CI workflow to use tools/build instead of make

Makefile

@@ -1,7 +1,7 @@
 # Variables
 ROOT_DIR := $(PWD)
 BUILD_TOOL := $(ROOT_DIR)/tools/build
-DISTRO ?= el/9  # Default to el/9 if not specified
+DISTRO ?= almalinux/el9
 
 # Automatically find all packages with metadata.yaml
 PACKAGES := $(shell find $(ROOT_DIR)/rpms -mindepth 1 -maxdepth 1 -type d -exec test -f {}/metadata.yaml \; -print | xargs -n1 basename | sort)
@@ -20,33 +20,18 @@ list:
 # Build all packages using Python tool
 build-all:
 	@echo "Building all packages using Python tooling for distro $(DISTRO)..."
-	$(BUILD_TOOL) --all --distro $(DISTRO)
+	$(BUILD_TOOL) build-all --distro $(DISTRO)
 
 # Build specific package using Python tool
 .PHONY: $(PACKAGES)
 $(PACKAGES):
 	@echo "Building package: $@ for distro $(DISTRO)"
-	$(BUILD_TOOL) --package $@ --distro $(DISTRO)
-
-# Build specific package with version/release override
-build:
-	@if [ -z "$(PACKAGE_NAME)" ]; then \
-		echo "Error: PACKAGE_NAME not specified"; \
-		echo "Usage: make build PACKAGE_NAME=package [PACKAGE_VERSION=version] [PACKAGE_RELEASE=release]"; \
-		exit 1; \
-	fi
-	@if [ -n "$(PACKAGE_VERSION)" ] && [ -n "$(PACKAGE_RELEASE)" ]; then \
-		echo "Building $(PACKAGE_NAME) with explicit version $(PACKAGE_VERSION)-$(PACKAGE_RELEASE) for distro $(DISTRO)"; \
-		$(BUILD_TOOL) --package $(PACKAGE_NAME) --version $(PACKAGE_VERSION) --release $(PACKAGE_RELEASE) --distro $(DISTRO); \
-	else \
-		echo "Building $(PACKAGE_NAME) using metadata.yaml for distro $(DISTRO)"; \
-		$(BUILD_TOOL) --package $(PACKAGE_NAME) --distro $(DISTRO); \
-	fi
+	$(BUILD_TOOL) build --distro $(DISTRO) $@
 
 # Dry run - show what would be built without building
 dry-run:
 	@echo "Dry run - showing what would be built for distro $(DISTRO):"
-	$(BUILD_TOOL) --all --distro $(DISTRO) --dry-run
+	$(BUILD_TOOL) build-all --distro $(DISTRO) --dry-run
 
 # Clean target
 clean:
@@ -62,24 +47,3 @@ update:
 update-%:
 	@echo "Checking for updates for package: $*"
 	$(ROOT_DIR)/tools/update-gh --package $*
-
-# Help target
-help:
-	@echo "Available targets:"
-	@echo "  all          - Build all packages (default)"
-	@echo "  list         - List all available packages"
-	@echo "  build-all    - Build all packages using Python tooling"
-	@echo "  <package>    - Build specific package (e.g., 'make consul')"
-	@echo "  build        - Build with explicit PACKAGE_NAME, PACKAGE_VERSION, PACKAGE_RELEASE"
-	@echo "  dry-run      - Show what would be built without building"
-	@echo "  clean        - Remove build artifacts"
-	@echo "  update       - Check all packages for GitHub release updates"
-	@echo "  update-<pkg> - Check specific package for GitHub release updates"
-	@echo "  help         - Show this help message"
-	@echo ""
-	@echo "Examples:"
-	@echo "  make consul                                    # Build consul using metadata.yaml"
-	@echo "  make build PACKAGE_NAME=consul                # Build consul using metadata.yaml"
-	@echo "  make build PACKAGE_NAME=consul PACKAGE_VERSION=1.21.1 PACKAGE_RELEASE=1"
-	@echo "  make update-consul                             # Check consul for GitHub updates"
-	@echo "  make dry-run                                   # Show what would be built"