Add Make targets for formatting and linting

Add configuration and document usage in README

Entire-Checkpoint: 53425877e242

.golangci.yml

@@ -0,0 +1,30 @@
+run:
+  timeout: 5m
+
+linters:
+  enable:
+    - gofumpt      # gofumpt = true
+    - staticcheck  # staticcheck = true
+    - unparam      # unusedparams = true
+    - nilnil       # nilness = true (catches nil returns of nil interface values)
+    - govet        # base vet; nilness + unusedwrite via govet analyzers
+
+linters-settings:
+  gofumpt:
+    module-path: github.com/ClusterCockpit/cc-backend
+
+  govet:
+    enable:
+      - nilness
+      - unusedwrite
+
+issues:
+  exclude-dirs:
+    - .git
+    - .vscode
+    - .idea
+    - node_modules
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - unparam

Makefile

@@ -36,7 +36,7 @@ SVELTE_SRC = $(wildcard $(FRONTEND)/src/*.svelte)                 \
 			 $(wildcard $(FRONTEND)/src/header/*.svelte)          \
 			 $(wildcard $(FRONTEND)/src/job/*.svelte)
 
-.PHONY: clean distclean test tags frontend swagger graphql $(TARGET)
+.PHONY: clean distclean fmt lint test tags frontend swagger graphql $(TARGET)
 
 .NOTPARALLEL:
 
@@ -75,6 +75,14 @@ test:
 	@go vet ./...
 	@go test ./...
 
+fmt:
+	$(info ===>  FORMAT)
+	@gofumpt -l -w .
+
+lint:
+	$(info ===>  LINT)
+	@golangci-lint run ./...
+
 tags:
 	$(info ===>  TAGS)
 	@ctags -R

README.md

@@ -100,6 +100,26 @@ the following targets:
   frontend source files will result in a complete rebuild.
 - `make clean`: Clean go build cache and remove binary.
 - `make test`: Run the tests that are also run in the GitHub workflow setup.
+- `make fmt`: Format all Go source files using
+  [gofumpt](https://github.com/mvdan/gofumpt), a stricter superset of `gofmt`.
+  Requires `gofumpt` to be installed (see below).
+- `make lint`: Run [golangci-lint](https://golangci-lint.run/) with the project
+  configuration in `.golangci.yml`. Requires `golangci-lint` to be installed
+  (see below).
+
+### Installing development tools
+
+`gofumpt` and `golangci-lint` are not part of the Go module and must be
+installed separately:
+
+```sh
+# Formatter (gofumpt)
+go install mvdan.cc/gofumpt@latest
+
+# Linter (golangci-lint) — use the official install script to get a
+# pre-built binary; installing via `go install` is not supported upstream.
+curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b $(go env GOPATH)/bin
+```
 
 A common workflow for setting up cc-backend from scratch is:
 

gopls.json

@@ -0,0 +1,49 @@
+{
+    "gofumpt": true,
+    "codelenses": {
+        "gc_details": false,
+        "generate": true,
+        "regenerate_cgo": true,
+        "run_govulncheck": true,
+        "test": true,
+        "tidy": true,
+        "upgrade_dependency": true,
+        "vendor": true
+    },
+    "hints": {
+        "assignVariableTypes": true,
+        "compositeLiteralFields": true,
+        "compositeLiteralTypes": true,
+        "constantValues": true,
+        "functionTypeParameters": true,
+        "parameterNames": true,
+        "rangeVariableTypes": true
+    },
+    "analyses": {
+        "nilness": true,
+        "unusedparams": true,
+        "unusedwrite": true,
+        "useany": true
+    },
+    "usePlaceholders": true,
+    "completeUnimported": true,
+    "staticcheck": true,
+    "directoryFilters": [
+        "-.git",
+        "-.vscode",
+        "-.idea",
+        "-.vscode-test",
+        "-node_modules",
+        "-web/frontend",
+        "-web/templates",
+        "-var",
+        "-api",
+        "-configs",
+        "-init",
+        "-internal/repository/migrations",
+        "-internal/repository/testdata",
+        "-internal/importer/testdata",
+        "-pkg/archive/testdata"
+    ],
+    "semanticTokens": true
+}