diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
index b30f4c2..d1720e8 100644
--- a/.github/ISSUE_TEMPLATE/config.yml
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -1,3 +1,4 @@
+---
 blank_issues_enabled: true
 contact_links:
   - name: Ask a question or get support
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index ff5a456..19bbac6 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,3 +1,4 @@
+---
 version: 2
 updates:
   - package-ecosystem: docker
diff --git a/.github/workflows/anchore-analysis.yml b/.github/workflows/anchore-analysis.yml
index 4a5dbe0..16ca790 100644
--- a/.github/workflows/anchore-analysis.yml
+++ b/.github/workflows/anchore-analysis.yml
@@ -1,10 +1,13 @@
+---
 name: Anchore Container Scan
 
 on:
   push:
-    branches: [ main ]
+    branches:
+      - main
   pull_request:
-    branches: [ main ]
+    branches:
+      - main
   schedule:
     - cron: '17 7 * * 5'
 
@@ -16,17 +19,17 @@ jobs:
   Anchore-Build-Scan:
     runs-on: ubuntu-24.04
     steps:
-    - name: Checkout the code
-      uses: actions/checkout@v4
-    - name: Build the Docker image
-      run: docker build . --file Dockerfile --tag localbuild/testimage:latest
-    - name: Run the Anchore scan action itself with GitHub Advanced Security code scanning integration enabled
-      uses: anchore/scan-action@v6
-      id: anchore_scan
-      with:
-        image: "localbuild/testimage:latest"
-        fail-build: false
-    - name: Upload Anchore Scan Report
-      uses: github/codeql-action/upload-sarif@v3
-      with:
-        sarif_file: ${{ steps.anchore_scan.outputs.sarif }}
+      - name: Checkout the code
+        uses: actions/checkout@v4
+      - name: Build the Docker image
+        run: docker build . --file Dockerfile --tag localbuild/testimage:latest
+      - name: Run the Anchore scan action itself with GitHub Advanced Security code scanning integration enabled
+        uses: anchore/scan-action@v6
+        id: anchore_scan
+        with:
+          image: "localbuild/testimage:latest"
+          fail-build: false
+      - name: Upload Anchore Scan Report
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: ${{ steps.anchore_scan.outputs.sarif }}
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 6f6a6a9..88dec57 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -1,3 +1,4 @@
+---
 name: 'Dependency Review'
 on: [pull_request]
 
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 734a71c..0fad353 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -1,3 +1,4 @@
+---
 name: Lint
 on: pull_request
 
@@ -17,6 +18,22 @@ jobs:
     name: markdown
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v4
-    - name: Run markdownlint
-      uses: DavidAnson/markdownlint-cli2-action@v18
+      - uses: actions/checkout@v4
+      - name: Run markdownlint
+        uses: DavidAnson/markdownlint-cli2-action@v18
+
+  actionlint:
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-actionlint@v1
+
+  yamllint:
+    name: Yamllint
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run Yamllint
+        uses: frenck/action-yamllint@v1.5.0
+        with:
+          strict: true
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index e25f020..0d526f6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,3 +1,4 @@
+---
 name: Release
 on:
   workflow_run:
@@ -23,29 +24,29 @@ jobs:
           DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
       - name: Major version tag
         id: major-version
-        if: ${{ steps.version.outputs.new_tag }} != ""
+        if: ${{ steps.version.outputs.new_tag }}
         uses: actions/github-script@v7
         with:
           script: |
             core.setOutput('tag', '${{ steps.version.outputs.new_tag }}'.split('.')[0])
       - name: Tag ${{ steps.major-version.outputs.tag }}
-        if: ${{ steps.version.outputs.new_tag }} != ""
+        if: ${{ steps.version.outputs.new_tag }}
         run: |
           git tag --force ${{ steps.major-version.outputs.tag }}
           git push origin ${{ steps.major-version.outputs.tag }} --force
       - name: Get current date
-        if: ${{ steps.version.outputs.new_tag }} != ""
+        if: ${{ steps.version.outputs.new_tag }}
         id: date
-        run: echo "::set-output name=date::$(date --iso-8601)"
+        run: echo "name=date::$(date --iso-8601)" >> "$GITHUB_STATE"
       - name: Get shoutrrr version
-        if: ${{ steps.version.outputs.new_tag }} != ""
+        if: ${{ steps.version.outputs.new_tag }}
         id: shoutrrr
-        run: echo "::set-output name=version::$(docker run --rm $(docker build --quiet - < Dockerfile) --version)"
+        run: echo "name=version::$(docker run --rm "$(docker build --quiet - < Dockerfile)" --version)" >> "$GITHUB_STATE"
       - name: Build full ChangeLog
-        if: ${{ steps.version.outputs.new_tag }} != ''
+        if: ${{ steps.version.outputs.new_tag }}
         run: npx conventional-changelog-cli --release-count=0 --preset=eslint --outfile="${{ runner.temp }}/FullChangeLog.md"
       - name: Create/update release ${{ steps.major-version.outputs.tag }}
-        if: ${{ steps.version.outputs.new_tag }} != ""
+        if: ${{ steps.version.outputs.new_tag }}
         uses: ncipollo/release-action@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -54,10 +55,10 @@ jobs:
           name: ${{ steps.version.outputs.new_tag }} (${{ steps.date.outputs.date }} / ${{ steps.shoutrrr.outputs.version }})
           bodyFile: ${{ runner.temp }}/FullChangeLog.md
       - name: Build ChangeLog
-        if: ${{ steps.version.outputs.new_tag }} != ''
+        if: ${{ steps.version.outputs.new_tag }}
         run: npx conventional-changelog-cli --release-count=2 --outfile="${{ runner.temp }}/ChangeLog.md"
       - name: Create release ${{ steps.version.outputs.new_tag }}
-        if: ${{ steps.version.outputs.new_tag }} != ""
+        if: ${{ steps.version.outputs.new_tag }}
         uses: ncipollo/release-action@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 162d777..9e9d158 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,3 +1,4 @@
+---
 name: Build and test
 on:
   pull_request:
diff --git a/.yamllint b/.yamllint
new file mode 100644
index 0000000..7e0c742
--- /dev/null
+++ b/.yamllint
@@ -0,0 +1,14 @@
+---
+extends: default
+
+rules:
+  indentation:
+    spaces: 2
+  line-length: disable
+  truthy:
+    check-keys: false
+  braces:
+    min-spaces-inside: 1
+    max-spaces-inside: 1
+    min-spaces-inside-empty: 0
+    max-spaces-inside-empty: 0
diff --git a/action.yml b/action.yml
index 5e46d4c..39a3c26 100644
--- a/action.yml
+++ b/action.yml
@@ -1,3 +1,4 @@
+---
 name: 'Shoutrrr action'
 description: 'Notifications using https://containrrr.dev/shoutrrr'
 branding: