chore: add DEVELOPMENT.md and release instructions (#90)

DEVELOPMENT.md

@@ -0,0 +1,42 @@
+# Release Process
+
+Pick a new version:
+
+```sh
+export NEW_VERSION="v1.x.x"
+```
+
+Update all version strings:
+
+```sh
+make version-bump version=${NEW_VERSION}
+```
+
+Update `CHANGELOG.md`:
+
+```sh
+make changelog tag=${NEW_VERSION}
+```
+
+Check changes and commit/push:
+
+```sh
+git status
+git add .
+git commit -m "chore: bump version to ${NEW_VERSION}"
+```
+
+You should see something similar to:
+
+```console
+On branch feat/foobar
+Changes not staged for commit:
+  (use "git add <file>..." to update what will be committed)
+  (use "git restore <file>..." to discard changes in working directory)
+	modified:   CHANGELOG.md
+	modified:   Makefile
+	modified:   README.md
+	modified:   cmd/pretender/main.go
+```
+
+Create a new GitHub release using the value in `${NEW_VERSION}` as name and tag. The new release will trigger the automation to upload the binaries and push a docker image to DockerHub.

Makefile

@@ -4,6 +4,7 @@ GOFUMPT_VERSION := v0.6.0
 GOLANGCI_LINT_VERSION := v1.57.2
 RESPONSES_FILE ?= examples/example.json
 BINARY_NAME := pretender
+BINARY_VERSION := v1.8.0
 OS_LIST := darwin linux
 ARCH_LIST := arm64 amd64
 BUILD_TARGETS := $(foreach os,$(OS_LIST),$(foreach arch,$(ARCH_LIST),bin/$(BINARY_NAME)-$(os)-$(arch)))
@@ -96,6 +97,15 @@ changelog: bin/git-chglog
 	@git fetch --tags > /dev/null 2>&1
 	@bin/git-chglog --no-emoji -o CHANGELOG.md --next-tag $(tag)
 
+version-bump:
+	@echo ""
+	@echo "bumping version to $(version)"
+	@find . \
+	  -path ./.git -prune -o \
+		-type f \
+		-exec ex -sc '%s/$(BINARY_VERSION)/$(version)/g' -c 'x' {} \;
+	@git status
+
 .PHONY: version-check
 version-check:
 	@echo ""