Package what this repo does in GH Action + add tests for it

.github/workflows/test.yml

@@ -8,7 +8,7 @@ on:
     branches:
       - master
 jobs:
-  test:
+  test_local:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -21,3 +21,20 @@ jobs:
         run: ./test-generate-gpg
       - name: Run tests
         run: ./docker-test-all
+  test_as_action:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Download test packages
+        run: ./test-download-debs
+      - name: Generate test GPG keys
+        run: ./test-generate-gpg
+      - name: Run action - create repo from scratch
+        uses: ./ # Uses an action in the root directory
+        id: az_repo_apt_add
+        with:
+          az_storage_sas_token: ${{ secrets.TEST_AZURE_STORAGE_SAS_TOKEN }}
+          az_storage_account: packageskaitai
+          az_storage_container: test3
+          packages: all_pkgs/kaitai-struct-compiler_0.7_all.deb

Dockerfile

@@ -0,0 +1,35 @@
+# Central Dockerfile for GitHub Action invoking `az-repo-apt-add`
+
+# Use Ubuntu 24.04 as base image - it's simpler to start off Debian-based OS,
+# given that we'll be using `dpkg-scanpackages`
+FROM ubuntu:24.04
+
+# Install Ubuntu native prerequisites
+RUN \
+	apt-get update && \
+	apt-get install -y \
+		dpkg-dev \
+		ca-certificates \
+		curl \
+		apt-transport-https \
+		lsb-release \
+		gnupg
+
+# Install Azure CLI
+RUN \
+	curl -sL https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor | tee /etc/apt/trusted.gpg.d/microsoft.gpg > /dev/null && \
+	echo "deb [arch=amd64] https://packages.microsoft.com/repos/azure-cli/ $(lsb_release -cs) main" | tee /etc/apt/sources.list.d/azure-cli.list && \
+	apt-get update && \
+	apt-get install azure-cli
+
+COPY \
+	az-repo-apt-add \
+	repo-apt-handle \
+	common.sh \
+	./
+
+# Ensures that Action maps all the paths in invoking workspace, e.g.
+# paths to .deb files to publish
+WORKDIR /github/workspace
+
+ENTRYPOINT ["/az-repo-apt-add"]

action.yml

@@ -0,0 +1,23 @@
+name: Publish .deb package
+description: Add .deb package to apt repository hosted on Azure Blob Storage
+inputs:
+  az_storage_sas_token:
+    description: Azure Storage SAS token
+    required: true
+  az_storage_account:
+    description: Azure Storage account name
+    required: true
+  az_storage_container:
+    description: Azure Storage container name
+    required: true
+  packages:
+    description: List of paths to .deb packages to publish
+    required: true
+runs:
+  using: docker
+  image: Dockerfile
+  env:
+    AZURE_STORAGE_SAS_TOKEN: ${{ inputs.az_storage_sas_token }}
+    AZ_STORAGE_ACCOUNT: ${{ inputs.az_storage_account }}
+    AZ_STORAGE_CONTAINER: ${{ inputs.az_storage_container }}
+    PKGS_SRC: ${{ inputs.packages }}