ci: adding GitHub Actions Workflows linting

.github/workflows/github-actions-workflows.yml

@@ -0,0 +1,19 @@
+name: GitHub Actions Workflows
+
+on: pull_request
+
+env:
+  # Forcing Earthly to use colours, to make reading output easier.
+  FORCE_COLOR: 1
+
+jobs:
+  linting:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download Earthly v0.8.12.
+        run: "sudo /bin/sh -c 'wget https://github.com/earthly/earthly/releases/download/v0.8.12/earthly-linux-amd64 -O /usr/local/bin/earthly && chmod +x /usr/local/bin/earthly'"
+      - name: Checkout code.
+        uses: actions/checkout@v3
+      - name: Check GitHub Actions workflows linting.
+        run: earthly +check-github-actions-workflows-linting

Earthfile

@@ -1,6 +1,30 @@
 VERSION 0.7
 
 
+COPY_CI_DATA:
+    COMMAND
+    COPY --dir "ci/" ".github/" "./"
+
+
+golang-base:
+    FROM golang:1.22.1
+    ENV GOPROXY=direct
+    ENV CGO_ENABLED=0
+    ENV GOOS=linux
+    ENV GOARCH=amd64
+
+
+check-github-actions-workflows-linting:
+    FROM +golang-base
+    RUN go install github.com/rhysd/actionlint/cmd/[email protected]
+    DO +COPY_CI_DATA
+    RUN ./ci/check-github-actions-workflows-linting.sh
+
+
+check-linting:
+    BUILD +check-github-actions-workflows-linting
+
+
 e2e-formatting-base:
 		FROM python:3.12.0-slim
 		COPY "./ci" "./ci"

ci/check-github-actions-workflows-linting.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env sh
+
+set -o errexit
+set -o xtrace
+
+actionlint --verbose .github/workflows/*