Add workflow to build devcontainer (on push or on dispatch)

.devcontainer/version.txt

@@ -0,0 +1 @@
+0.0.1

.github/workflows/publish-devcontainer-image.yaml

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+name: Publish splunk-otel-collector-chart-dev-container
+
+on:
+  push:
+    paths:
+      - '.devcontainer/version.txt'
+  workflow_dispatch:
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Read version
+        run: echo "VERSION=$(cat ./.devcontainer/version.txt)" >> $GITHUB_ENV
+
+      - uses: docker/setup-buildx-action@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Cache Docker layers
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - name: Login to GitHub Package Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          file: ./.devcontainer/Dockerfile
+          tags: |
+            ghcr.io/${{ github.repository }}/devcontainer:${{ env.VERSION }}
+            ghcr.io/${{ github.repository }}/devcontainer:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache