Unifiy github action workflows into a single one

.github/workflows/building.yml

@@ -0,0 +1,34 @@
+name: Building binaries.
+on:
+  push:
+    branches:
+      - master
+jobs:
+  build-windows-binary:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+    - name: build binary
+      run: |
+        docker build . -f Dockerfile.pc-win  -t sdl2_playground-builder-pc-win
+        docker run --rm -v ${PWD}:/project sdl2_playground-builder-pc-win make -f Makefile.pc-win
+    - uses: actions/upload-artifact@master
+      with:
+       name: windows-x64-shared 
+       path: "*.exe"
+  build-linux-x86-64-binary:
+    runs-on: ubuntu-18.04
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: true
+    - name: build binary
+      run: |
+        docker build . -f Dockerfile.pc  -t sdl2_playground-builder-pc
+        docker run --rm -v ${PWD}:/project sdl2_playground-builder-pc bash -c "cd .. && bash filelist.sh"
+        docker run --rm -v ${PWD}:/project sdl2_playground-builder-pc cmake ..
+        docker run --rm -v ${PWD}:/project sdl2_playground-builder-pc make
+    - uses: actions/upload-artifact@master
+      with:
+       name: linux-x86-64-shared
+       path: "./cmake-build/SDL2_Playground"

.github/workflows/linux-x86-64.yml

@@ -1,20 +0,0 @@
-name: linux-x86-64 building.
-on:
-  push:
-    branches:
-      - master
-jobs:
-  build-binary:
-    runs-on: ubuntu-18.04
-    steps:
-    - uses: actions/checkout@v2
-    - name: build binary
-      run: |
-        docker build . -f Dockerfile.pc  -t sdl2_playground-builder-pc
-        docker run -it --rm -v ${PWD}:/project sdl2_playground-builder-pc bash -c "cd .. && bash filelist.sh"
-        docker run -it --rm -v ${PWD}:/project sdl2_playground-builder-pc cmake ..
-        docker run -it --rm -v ${PWD}:/project sdl2_playground-builder-pc make
-    - uses: actions/upload-artifact@master
-      with:
-       name: linux-x86-64-shared binary
-       path: "./cmake-build/SDL2_Playground"

.github/workflows/pc-win.yml

@@ -1,18 +0,0 @@
-name: Windows building.
-on:
-  push:
-    branches:
-      - master
-jobs:
-  build-binary:
-    runs-on: ubuntu-18.04
-    steps:
-    - uses: actions/checkout@v2
-    - name: build binary
-      run: |
-        docker build . -f Dockerfile.pc-win  -t sdl2_playground-builder-pc-win
-        docker run --rm -v ${PWD}:/project sdl2_playground-builder-pc-win make -f Makefile.pc-win
-    - uses: actions/upload-artifact@master
-      with:
-       name: windows-shared binary
-       path: "*.exe"

Dockerfile.pc

@@ -1,8 +1,6 @@
 FROM debian:sid-slim
-RUN DEBIAN_FRONTEND="noninteractive"
+ARG DEBIAN_FRONTEND=noninteractive
-RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
+RUN apt-get update && apt-get install -y --no-install-recommends apt-utils ca-certificates && \
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends apt-utils ca-certificates && \
     apt-get install -y --no-install-recommends build-essential make git && \
     apt-get install -y --no-install-recommends cmake && \
     apt-get install -y --no-install-recommends libsdl2-ttf-dev libsdl2-image-dev libsdl2-mixer-dev libsdl2-dev && \