Developer automation and documentation

.changes/unreleased/NOTES-20260714-120419.yaml

@@ -0,0 +1,3 @@
+kind: NOTES
+body: For developers of tfctl, added CONTRIBUTING.md, developer setup automation, and `make help`
+time: 2026-07-14T12:04:19.469961-06:00

.github/dependabot.yml

@@ -0,0 +1,42 @@
+version: 2
+# Update docker, github-actions, and gomod dependencies weekly with a semver-
+# sensitive cooldown and maximum open PR limits.
+updates:
+  - package-ecosystem: "docker"
+    open-pull-requests-limit: 1
+    directory: "/"
+    cooldown:
+      semver-major-days: 14
+      semver-minor-days: 7
+      semver-patch-days: 3
+    schedule:
+      interval: "weekly"
+    labels:
+      - dependencies
+      - automated
+
+  - package-ecosystem: "github-actions"
+    open-pull-requests-limit: 3
+    directory: "/"
+    cooldown:
+      semver-major-days: 14
+      semver-minor-days: 7
+      semver-patch-days: 3
+    schedule:
+      interval: "weekly"
+    labels:
+      - dependencies
+      - automated
+
+  - package-ecosystem: "gomod"
+    open-pull-requests-limit: 5
+    directory: "/"
+    cooldown:
+      semver-major-days: 14
+      semver-minor-days: 7
+      semver-patch-days: 3
+    schedule:
+      interval: "weekly"
+    labels:
+      - dependencies
+      - automated

.github/workflows/ci.yml

@@ -19,10 +19,14 @@ jobs:
         with:
           go-version-file: go.mod
 
+      - name: Read golangci-lint version
+        id: golangci-lint-version
+        run: echo "version=$(cat .golangci-lint-version | head -n 1)" >> $GITHUB_OUTPUT
+
       - name: Run golangci-lint
         uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20 # v9.2.0
         with:
-          version: v2.12
+          version: v${{ steps.golangci-lint-version.outputs.version }}
 
       - name: Run go test
-        run: go test ./... -v
+        run: make check

.golangci-lint-version

@@ -0,0 +1 @@
+2.12.2