Reduce redundant CI configuration by using local actions

.github/actions/apt/install/action.yml

@@ -0,0 +1,11 @@
+---
+inputs:
+  packages:
+    description: List of packages to install
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - run: sudo apt --yes install ${{ inputs.packages }}
+      shell: bash

.github/actions/apt/update/action.yml

@@ -0,0 +1,6 @@
+---
+runs:
+  using: composite
+  steps:
+    - run: sudo apt --yes update
+      shell: bash

.github/actions/build-archive/create/action.yml

@@ -0,0 +1,11 @@
+---
+runs:
+  using: composite
+  steps:
+    - name: Create build archive
+      run: |
+        tar --verbose --create --zstd \
+          --file=/tmp/workspace.tar.zst \
+          *
+      shell: bash
+      working-directory: ${{ github.workspace }}/..

.github/actions/build-archive/extract/action.yml

@@ -0,0 +1,10 @@
+---
+runs:
+  using: composite
+  steps:
+    - name: Extract build archive
+      run: |
+        tar --verbose --extract --zstd \
+          --file=/tmp/workspace.tar.zst
+      shell: bash
+      working-directory: ${{ github.workspace }}/..

.github/workflows/github-actions.yml

@@ -8,6 +8,15 @@ on:
       - master
       - develop
 
+env:
+  build-dependencies: >-
+    apache2-dev
+    libcairo2-dev
+    libcurl4-gnutls-dev
+    libglib2.0-dev
+    libiniparser-dev
+    libmapnik-dev
+
 jobs:
   lint-astyle:
     name: Lint code with `astyle`
@@ -16,9 +25,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Update installed packages
-        run: sudo apt --yes update
+        uses: ./.github/actions/apt/update
       - name: Install `astyle`
-        run: sudo apt --yes install astyle
+        uses: ./.github/actions/apt/install
+        with:
+          packages: astyle
       - name: Run `astyle`
         run: |
           astyle \
@@ -46,12 +57,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Update installed packages
-        run: sudo apt --yes update
+        uses: ./.github/actions/apt/update
       - name: Install build dependencies
-        run: |
+        uses: ./.github/actions/apt/install
-          sudo apt --yes install \
+        with:
-            apache2-dev libcairo2-dev libcurl4-gnutls-dev libglib2.0-dev \
+          packages: ${{ env.build-dependencies }}
-            libiniparser-dev libmapnik-dev
       - name: Run `./autogen.sh`
         run: ./autogen.sh
       - name: Run `./configure`
@@ -59,14 +69,12 @@ jobs:
       - name: Run `make`
         run: make
       - name: Create build archive
-        run: |
+        uses: ./.github/actions/build-archive/create
-          tar --verbose --create --file=/tmp/workspace.tar \
+      - name: Upload build archive
-            ${{ github.workspace }}
-      - name: Upload build artifacts
         uses: actions/upload-artifact@v2
         with:
-          name: build
+          name: build-archive
-          path: /tmp/workspace.tar
+          path: /tmp/workspace.tar.zst
 
   test-make-test:
     name: Test with `make test`
@@ -75,20 +83,21 @@ jobs:
       - build
       - lint-astyle
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
       - name: Update installed packages
-        run: sudo apt --yes update
+        uses: ./.github/actions/apt/update
       - name: Install build dependencies
-        run: |
+        uses: ./.github/actions/apt/install
-          sudo apt --yes install \
+        with:
-            apache2-dev libcairo2-dev libcurl4-gnutls-dev libglib2.0-dev \
+          packages: ${{ env.build-dependencies }}
-            libiniparser-dev libmapnik-dev
+      - name: Download build archive
-      - name: Download build artifacts
         uses: actions/download-artifact@v2
         with:
-          name: build
+          name: build-archive
           path: /tmp
       - name: Extract build archive
-        run: tar --verbose --extract --directory=/ --file=/tmp/workspace.tar
+        uses: ./.github/actions/build-archive/extract
       - name: Run `make test`
         run: make test
 
@@ -99,25 +108,22 @@ jobs:
       - build
       - lint-astyle
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
       - name: Update installed packages
-        run: sudo apt --yes update
+        uses: ./.github/actions/apt/update
-      - name: Install build dependencies
+      - name: Install build & test dependencies
-        run: |
+        uses: ./.github/actions/apt/install
-          sudo apt --yes install \
+        with:
-            apache2-dev libcairo2-dev libcurl4-gnutls-dev libglib2.0-dev \
+          packages: ${{ env.build-dependencies }} apache2 libjs-leaflet
-            libiniparser-dev libmapnik-dev libjs-leaflet
+      - name: Download build archive
-      - name: Install Apache HTTP Server
-        run: |
-          sudo apt --yes install \
-            apache2
-      - name: Download build artifacts
         uses: actions/download-artifact@v2
         with:
-          name: build
+          name: build-archive
           path: /tmp
       - name: Extract build archive
-        run: tar --verbose --extract --directory=/ --file=/tmp/workspace.tar
+        uses: ./.github/actions/build-archive/extract
-      - name: Set up Apache HTTP Server
+      - name: Configure Apache HTTP Server
         run: |
           sudo mkdir --parents /run/renderd /var/cache/renderd/tiles
           sudo ln --symbolic \