Add workflow

.github/actions/export-pngs/action.yml

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+name: 'Export PNGs'
+description: 'Export PNG files from a Kicad PCB'
+inputs:
+  pcb_file:
+    description: 'Kicad input file'
+    required: true
+  pngs_dir:
+    description: 'PNGs folder'
+    required: true
+  theme:
+    default: '-s set-black-enig'
+  # flags:
+  #   description: 'Additional flags for pcbdraw'
+  #   default: ''
+runs:
+  using: 'docker'
+  image: 'docker://yaqwsx/kikit:v1.0.2'
+  entrypoint: '/bin/sh'
+  args:
+    - '-c'
+    - |
+      mkdir -p $GITHUB_WORKSPACE/${{ inputs.pngs_dir }} ;
+      pcbdraw ${{ inputs.theme }} --silent $GITHUB_WORKSPACE/${{ inputs.pcb_file }} $GITHUB_WORKSPACE/${{ inputs.pngs_dir }}/front.png
+      pcbdraw --back ${{ inputs.theme }} --silent $GITHUB_WORKSPACE/${{ inputs.pcb_file }} $GITHUB_WORKSPACE/${{ inputs.pngs_dir }}/back.png

.github/workflows/render-previews.yml

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+on: [workflow_dispatch]
+
+name: Render Previews
+jobs:
+  pngs:
+    runs-on: ubuntu-latest
+    name: "Export as PNGs"
+    steps:
+      # CHECKOUT
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      # PREVIEWS
+      - name: Sweep v2
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: ./Sweepv2.2/sweepv2.kicad_pcb
+          pngs_dir: output/pngs/sweepv2
+      - name: Sweep Half Swept
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: ./Sweep-half-swept/half-swept.kicad_pcb
+          pngs_dir: output/pngs/sweep-half-swept
+      - name: Sweep High M
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep High M/sweep-high.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-high-m
+      - name: Sweep High
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep High/sweep-high.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-high
+      - name: Sweep Compact LOW
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep Compact LOW/ferris-sweep-compact.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-compact-low
+      - name: Sweep Bling MX
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep Bling MX/pcb/sweep-bling-mx__pcb.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-bling-mx
+      - name: Sweep Bling MX (plate)
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep Bling MX/switch-plate/sweep-bling-mx__plate.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-bling-mx-plate
+      - name: Sweep Bling MX (bottom)
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep Bling MX/bottom-plate/sweep-bling-mx__bottom.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-bling-mx-bottom
+      - name: Sweep Bling LP
+        uses: ./.github/actions/export-pngs
+        with:
+          pcb_file: '"./Sweep Bling LP/pcb/sweepbling-lp__pcb.kicad_pcb"'
+          pngs_dir: output/pngs/sweep-bling-lp
+
+      # UPLOADING
+      - name: Upload files
+        uses: actions/upload-artifact@v2
+        with:
+          name: previews
+          path: output/pngs