Add README, github workflow

.github/workflows/publish.yaml

@@ -0,0 +1,45 @@
+---
+name: Publish
+on:
+  push: {branches: ["main"]}
+  workflow_dispatch:
+  workflow_run:
+    branches: ["main"]
+    types:
+      - completed
+jobs:
+  publish:
+    name: Build and publish
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with: {fetch-depth: 0}
+
+      - name: Login to container registry
+        uses: docker/login-action@v3
+        with:
+          registry: https://git.kree.gr
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE_NAME }}
+          flavor: |
+            latest=auto
+            prefix=
+            suffix=
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=sha,prefix=
+
+      - name: Build and publish
+        uses: devcontainers/ci@v0.3
+        with:
+          imageName: git.kree.gr/kreeger/devcontainer
+          cacheFrom: git.kree.gr/kreeger/devcontainer
+          push: always

README.md

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+# Kreeger's devcontainer
+
+A devcontainer build that I use as the base for all my dev work.
+
+## Building locally
+
+Make sure you have the prerequisites installed. For me this meant BuildX and
+BuildKit for Docker.
+
+```bash
+$ brew install docker-buildx
+$ brew install buildkit
+$ VERSION=$(curl https://api.github.com/repos/docker/buildx/releases/latest -s | jq .name -r)
+$ ARCH=arm64
+$ curl -LO https://github.com/docker/buildx/releases/download/${VERSION}/buildx-${VERSION}.darwin-${ARCH}
+$ mkdir -p ~/.docker/cli-plugins
+$ mv buildx-${VERSION}.darwin-${ARCH} ~/.docker/cli-plugins/docker-buildx
+$ chmod +x ~/.docker/cli-plugins/docker-buildx
+$ docker buildx version
+```
+
+Login to Gitea.
+
+```bash
+$ docker login git.kree.gr
+```
+
+And then build the thing.
+
+```bash
+$ DOCKER_BUILDKIT=1 devcontainer build --workspace-folder . \
+      --push true --image-name \
+      git.kree.gr/kreeger/devcontainer:${$(git rev-parse HEAD):-8}
+```