ci: improve cache reuse and drop redundant build work

- e2e and checks-backend: enable build-cache restore so they hit the
  seeded gobuild cache.
- pgsql/sqlite/mysql/mssql: replace `make backend` with
  `make generate-go`. Integration tests build their own test binary
  and never invoke the gitea executable; only bindata generation is
  needed.
- unit-tests-gogit: narrow to packages with gogit/nogogit-tagged
  files via a new `test-backend-gogit` Makefile target. Other
  packages produce identical compiled output regardless of the gogit
  tag, so retesting them was busywork.
- cache-seeder: stop the lint job from competing with the gobuild
  job on the shared non-rotated gobuild key.

Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

.github/workflows/cache-seeder.yml

@@ -64,6 +64,8 @@ jobs:
       - uses: ./.github/actions/go-cache
         with:
           cache-name: ${{ matrix.job }}
+          # the gobuild job already saves the shared gobuild cache key; let only it win.
+          build-cache: "false"
           lint-cache: "true"
       - run: make deps-backend deps-tools
       - run: make ${{ matrix.target }}

.github/workflows/pull-compliance.yml

@@ -78,7 +78,6 @@ jobs:
       - uses: ./.github/actions/go-cache
         with:
           cache-name: checks-backend
-          build-cache: "false"
       - run: make deps-backend deps-tools
       - run: make --always-make checks-backend # ensure the "go-licenses" make target runs
 

.github/workflows/pull-db-tests.yml

@@ -52,8 +52,7 @@ jobs:
           cache-name: pgsql
       - name: Add hosts to /etc/hosts
         run: '[ -e "/.dockerenv" ] || [ -e "/run/.containerenv" ] || echo "127.0.0.1 pgsql ldap minio" | sudo tee -a /etc/hosts'
-      - run: make deps-backend
-      - run: make backend
+      - run: make deps-backend generate-go
         env:
           TAGS: bindata
       - name: run migration tests
@@ -81,8 +80,7 @@ jobs:
       - uses: ./.github/actions/go-cache
         with:
           cache-name: sqlite
-      - run: make deps-backend
-      - run: make backend
+      - run: make deps-backend generate-go
         env:
           TAGS: bindata gogit
           GOEXPERIMENT:
@@ -161,7 +159,7 @@ jobs:
           TAGS: bindata
           GITHUB_READ_TOKEN: ${{ secrets.GITHUB_READ_TOKEN }}
       - name: unit-tests-gogit
-        run: make test-backend test-check
+        run: make test-backend-gogit test-check
         env:
           GOTEST_FLAGS: -race -timeout=20m
           TAGS: bindata gogit
@@ -209,8 +207,7 @@ jobs:
           cache-name: mysql
       - name: Add hosts to /etc/hosts
         run: '[ -e "/.dockerenv" ] || [ -e "/run/.containerenv" ] || echo "127.0.0.1 mysql elasticsearch smtpimap" | sudo tee -a /etc/hosts'
-      - run: make deps-backend
-      - run: make backend
+      - run: make deps-backend generate-go
         env:
           TAGS: bindata
       - name: run migration tests
@@ -250,8 +247,7 @@ jobs:
           cache-name: mssql
       - name: Add hosts to /etc/hosts
         run: '[ -e "/.dockerenv" ] || [ -e "/run/.containerenv" ] || echo "127.0.0.1 mssql devstoreaccount1.azurite.local" | sudo tee -a /etc/hosts'
-      - run: make deps-backend
-      - run: make backend
+      - run: make deps-backend generate-go
         env:
           TAGS: bindata
       - run: GITEA_TEST_DATABASE=mssql make test-migration

.github/workflows/pull-e2e-tests.yml

@@ -28,7 +28,6 @@ jobs:
       - uses: ./.github/actions/go-cache
         with:
           cache-name: e2e
-          build-cache: "false"
       - uses: pnpm/action-setup@8912a9102ac27614460f54aedde9e1e7f9aec20d # v6.0.5
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:

Makefile

@@ -112,6 +112,7 @@ LINUX_ARCHS ?= linux/amd64,linux/386,linux/arm-5,linux/arm-6,linux/arm64,linux/r
 
 GO_TEST_PACKAGES ?= $(filter-out $(shell $(GO) list code.gitea.io/gitea/models/migrations/...) code.gitea.io/gitea/tests/integration/migration-test code.gitea.io/gitea/tests code.gitea.io/gitea/tests/integration,$(shell $(GO) list ./... | grep -v /vendor/))
 MIGRATE_TEST_PACKAGES ?= $(shell $(GO) list code.gitea.io/gitea/models/migrations/...)
+GO_GOGIT_TEST_PACKAGES ?= code.gitea.io/gitea/modules/git/... code.gitea.io/gitea/modules/gitrepo/... code.gitea.io/gitea/modules/lfs/...
 
 FRONTEND_SOURCES := $(shell find web_src/js web_src/css -type f)
 FRONTEND_CONFIGS := vite.config.ts tailwind.config.ts
@@ -381,6 +382,11 @@ test-backend: ## test backend files
 	@echo "Running go test with $(GOTEST_FLAGS) -tags '$(TAGS)'..."
 	@$(GO) test $(GOTEST_FLAGS) -tags='$(TAGS)' $(GO_TEST_PACKAGES)
 
+.PHONY: test-backend-gogit
+test-backend-gogit: ## test gogit-affected packages only
+	@echo "Running go test with $(GOTEST_FLAGS) -tags '$(TAGS)' over gogit-affected packages..."
+	@$(GO) test $(GOTEST_FLAGS) -tags='$(TAGS)' $(GO_GOGIT_TEST_PACKAGES)
+
 .PHONY: test-frontend
 test-frontend: node_modules ## test frontend files
 	pnpm exec vitest