Add ymllint, shellcheck and other actions

.github/workflows/build.yaml

@@ -16,7 +16,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v5

.github/workflows/markdownlint.yaml

@@ -0,0 +1,17 @@
+---
+name: Lint Markdown Files
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Run linter
+        uses: actionshub/markdownlint@main

.github/workflows/rebase_checker.yaml

@@ -0,0 +1,8 @@
+---
+name: Check that 'main' is not merged into the development branch
+
+on: pull_request
+
+jobs:
+  call-workflow:
+    uses: lsst/rubin_workflows/.github/workflows/rebase_checker.yaml@main

.github/workflows/shellcheck.yaml

@@ -0,0 +1,18 @@
+---
+name: shellcheck
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run shellcheck
+        uses: ludeeus/action-shellcheck@master
+        # See https://github.com/ludeeus/action-shellcheck for customizations

.github/workflows/yamllint.yaml

@@ -0,0 +1,25 @@
+---
+name: Lint YAML Files
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v3
+        with:
+          python-version: 3.12
+
+      - name: Install
+        run: pip install yamllint
+
+      - name: Run linter
+        run: yamllint .