chore: import upstream snapshot with attribution

.github/workflows/docker.yml

@@ -0,0 +1,90 @@
+name: docker
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'release/*'
+    tags:
+      - 'v*.*'
+
+env:
+  # Platforms to build the image for
+  BUILD_PLATFORMS: linux/amd64,linux/arm64
+  DOCKERHUB_REPO: ${{ github.repository_owner }}/idf
+
+jobs:
+  docker:
+    # Disable the job in forks
+    if: ${{ github.repository_owner == 'espressif' }}
+
+    runs-on: ubuntu-24.04-X64-large
+    steps:
+      # Depending on the branch/tag, set CLONE_BRANCH_OR_TAG variable (used in the Dockerfile
+      # as a build arg) and TAG_NAME (used when tagging the image).
+      #
+      # The following 3 steps cover the alternatives (tag, release branch, master branch):
+      - name: Set variables (tags)
+        if: ${{ github.ref_type == 'tag' }}
+        run: |
+          echo "CLONE_BRANCH_OR_TAG=$GITHUB_REF_NAME" >> $GITHUB_ENV
+          echo "TAG_NAME=$GITHUB_REF_NAME" >> $GITHUB_ENV
+      - name: Set variables (release branches)
+        if: ${{ github.ref_type == 'branch' && startsWith(github.ref_name, 'release/') }}
+        run: |
+          echo "CLONE_BRANCH_OR_TAG=$GITHUB_REF_NAME" >> $GITHUB_ENV
+          echo "TAG_NAME=release-${GITHUB_REF_NAME##release/}" >> $GITHUB_ENV
+      - name: Set variables (main branch)
+        if: ${{ github.ref_type == 'branch' && github.ref_name == 'master' }}
+        run: |
+          echo "CLONE_BRANCH_OR_TAG=master" >> $GITHUB_ENV
+          echo "TAG_NAME=latest" >> $GITHUB_ENV
+
+      # Display the variables set above, just in case.
+      - name: Check variables
+        run: |
+          echo "CLONE_BRANCH_OR_TAG: $CLONE_BRANCH_OR_TAG"
+          echo "CHECKOUT_REF: $CHECKOUT_REF"
+          echo "TAG_NAME: $TAG_NAME"
+
+      # The following steps are the standard boilerplate from
+      # https://github.com/marketplace/actions/build-and-push-docker-images
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Set up QEMU for multiarch builds
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: tools/docker
+          push: true
+          tags: ${{ env.DOCKERHUB_REPO }}:${{ env.TAG_NAME }}
+          platforms: ${{ env.BUILD_PLATFORMS }}
+          build-args: |
+            IDF_CLONE_URL=${{ github.server_url }}/${{ github.repository }}.git
+            IDF_CLONE_BRANCH_OR_TAG=${{ env.CLONE_BRANCH_OR_TAG }}
+
+      - name: Update Docker Hub repository description (master branch)
+        if: ${{ github.ref_type == 'branch' && github.ref_name == 'master' }}
+        uses: peter-evans/dockerhub-description@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          # Token based authentication is not supported here:
+          # https://github.com/peter-evans/dockerhub-description/issues/10
+          # https://github.com/docker/roadmap/issues/115#issuecomment-891694974
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+          repository: ${{ env.DOCKERHUB_REPO }}
+          readme-filepath: ./tools/docker/README.md