CI: Build ct-ng once

Build ct-ng once and use the result to build the toolchains.

Signed-off-by: Chris Packham <judge.packham@gmail.com>

.github/workflows/continuous-integration-workflow.yml

@@ -5,7 +5,35 @@ on:
   pull_request:
 
 jobs:
-  build:
+  crosstool:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "clone"
+        uses: actions/checkout@v2
+      - name: "prereq"
+        run: |
+          sudo apt-get install -y gperf help2man libtool-bin
+      - name: "build ct-ng"
+        run: |
+          ./bootstrap
+          ./configure --prefix=$PWD/.local/
+          make
+          make install
+          tar -cf ct-ng.tar .local/
+      - name: "upload ct-ng"
+        uses: actions/upload-artifact@v2
+        with:
+          name: crosstool
+          path: ct-ng.tar
+      - name: "upload config.log"
+        uses: actions/upload-artifact@v2
+        with:
+          name: config.log
+          path: config.log
+        if: ${{ always() }}
+
+  toolchains:
+    needs: crosstool
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -18,26 +46,21 @@ jobs:
           "x86_64-multilib-linux-uclibc"
         ]
     steps:
-      - name: "clone"
-        uses: actions/checkout@v2
+      - name: "download ct-ng"
+        uses: actions/download-artifact@v2
+        with:
+          name: crosstool
+      - name: "extract ct-ng"
+        run: |
+          tar -xf ct-ng.tar
       - name: "prereq"
         run: |
           sudo apt-get install -y gperf help2man libtool-bin
-      - name: "build ct-ng"
-        run: |
-          ./bootstrap
-          ./configure --enable-local
-          make
-      - name: "upload config.log"
-        uses: actions/upload-artifact@v2
-        with:
-          name: config.log
-          path: config.log
-        if: ${{ always() }}
+          echo "::add-path::$GITHUB_WORKSPACE/.local/bin"
       - name: "build ${{ matrix.sample }}"
         run: |
           mkdir -p src
-          ./ct-ng ${{ matrix.sample }}
+          ct-ng ${{ matrix.sample }}
           sed -i -e '/CT_LOG_PROGRESS_BAR/s/y$/n/' .config
           sed -i -e '/CT_LOCAL_TARBALLS_DIR/s/HOME/CT_TOP_DIR/' .config
           sed -i -e '/CT_PREFIX_DIR/s/HOME/CT_TOP_DIR/' .config
@@ -45,7 +68,7 @@ jobs:
           sed -i -e '/CT_LOG_LEVEL_MAX/d' .config
           echo 'CT_LOG_ALL=y' >>.config
           echo 'CT_LOG_LEVEL_MAX="ALL"' >>.config
-          ./ct-ng build
+          ct-ng build
       - name: "upload log"
         uses: actions/upload-artifact@v2
         with: