ci: avoid installing dependencies in each job

.github/workflows/Image.yml

@@ -0,0 +1,51 @@
+name: Image
+
+on:
+  push:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * 5'
+
+jobs:
+
+  BuildAndPush:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    env:
+      IMAGE: ghcr.io/f4pga/prjxray/ci
+
+    steps:
+
+      - name: Build image prjxray/ci
+        run: |
+          docker build -t $IMAGE - <<EOF
+          FROM ubuntu:bionic
+          RUN apt-get update -qq \
+            && DEBIAN_FRONTEND=noninteractive apt-get -y install --no-install-recommends \
+               bash \
+               bison \
+               build-essential \
+               ca-certificates \
+               clang-format \
+               cmake \
+               psmisc \
+               colordiff \
+               coreutils \
+               git \
+               flex \
+               python3 \
+               python3-dev \
+               python3-venv \
+               xsltproc \
+               libtinfo5 \
+            && apt-get autoclean && apt-get clean && apt-get -y autoremove \
+            && update-ca-certificates \
+            && rm -rf /var/lib/apt/lists/*
+
+      - uses: pyTooling/Actions/with-post-step@r0
+        with:
+          main: |
+            echo '${{ github.token }}' | docker login ghcr.io -u gha --password-stdin
+            docker push $IMAGE
+          post: docker logout ghcr.io

.github/workflows/Pipeline.yml

@@ -7,9 +7,8 @@ jobs:
 
 
   BuildDatabase:
-    container: ubuntu:focal
-
     runs-on: [self-hosted, Linux, X64]
+    container: 'ghcr.io/f4pga/prjxray/ci'
 
     strategy:
       fail-fast: false
@@ -27,13 +26,6 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Install
-        run: |
-          DEBIAN_FRONTEND=noninteractive apt update -qq
-          DEBIAN_FRONTEND=noninteractive apt install -qq -y \
-            bash bison build-essential ca-certificates clang-format cmake psmisc \
-            colordiff coreutils git flex python3 python3-dev python3-venv xsltproc libtinfo5
-
       - name: Build
         run: make build --output-sync=target --warn-undefined-variables -j$(nproc)
 
@@ -61,9 +53,8 @@ jobs:
 
 
   Tests:
-    container: ubuntu:focal
-
     runs-on: [self-hosted, Linux, X64]
+    container: 'ghcr.io/f4pga/prjxray/ci'
 
     env:
       ALLOW_ROOT: true
@@ -74,13 +65,6 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Install
-        run: |
-          DEBIAN_FRONTEND=noninteractive apt update -qq
-          DEBIAN_FRONTEND=noninteractive apt install -qq -y \
-            bash bison build-essential ca-certificates clang-format cmake psmisc \
-            colordiff coreutils git flex python3 python3-dev python3-venv xsltproc libtinfo5
-
       - name: Build
         run: make build --output-sync=target --warn-undefined-variables -j$(nproc)