Add Makefile

This commit adds a Makefile to automate the steps required to build the
cacert-idp binary.

.gitignore

@@ -1,4 +1,5 @@
 .idea/
+/cacert-idp
 /static
 certs/
 idp.toml

Makefile

@@ -0,0 +1,25 @@
+GOFILES = $(wildcard */*.go)
+TEMPLATES = $(wildcard templates/*.gohtml)
+TRANSLATIONS = $(wildcard active.*.toml)
+
+all: cacert-idp
+
+go.sum: go.mod
+	go mod tidy
+
+translations: $(TRANSLATIONS) $(GOFILES)
+	goi18n extract .
+	goi18n merge active.*.toml
+	if translate.*.toml 2>/dev/null; then \
+		echo "missing translations"; \
+		goi18n merge active.*.toml translate.*.toml; \
+	fi
+
+cacert-idp: go.sum $(GOFILES) $(TEMPLATES) translations
+	go build -o $@ ./cmd/idp.go
+
+clean:
+	rm -f cacert-idp
+
+.PHONY: all translations clean
+