Reduced input variables

deploy/action.yml

@@ -5,22 +5,13 @@ inputs:
   app-name:
     required: true
     description: Application name (used for image/container naming)
-  tag:
+  branch:
     required: true
-    description: Image/container tag (e.g., "production" or a branch slug)
-  port:
-    required: true
-    description: Host port to expose
+    description: Branch name; the repo's default branch deploys as production, everything else as a preview
   internal-port:
     required: false
     default: "3000"
     description: Port the app listens on inside the container
-  environment:
-    required: true
-    description: Environment name ("production" or "preview")
-  subdomain:
-    required: true
-    description: Subdomain for Pangolin resource
   build-args:
     required: false
     default: ""
@@ -29,16 +20,50 @@ inputs:
 runs:
   using: composite
   steps:
+    - name: Derive deploy parameters
+      id: derive
+      shell: bash
+      env:
+        APP_NAME: ${{ inputs.app-name }}
+        BRANCH: ${{ inputs.branch }}
+        DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
+      run: |
+        BRANCH="${BRANCH#refs/heads/}"
+        DEFAULT_BRANCH="${DEFAULT_BRANCH:-main}"
+
+        if [[ "$BRANCH" == "$DEFAULT_BRANCH" ]]; then
+          TAG="production"
+          ENVIRONMENT="production"
+          SUBDOMAIN="$APP_NAME"
+          PORT=$(( 10000 + ( $(echo -n "${APP_NAME}-production" | cksum | awk '{print $1}') % 10000 ) ))
+        else
+          SLUG=$(echo "$BRANCH" | tr '/_' '--' | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9-]//g' | cut -c1-40)
+          TAG="$SLUG"
+          ENVIRONMENT="preview"
+          SUBDOMAIN="${SLUG}.${APP_NAME}"
+          PORT=$(( 20000 + ( $(echo -n "$SLUG" | cksum | awk '{print $1}') % 10000 ) ))
+        fi
+
+        REPO_SLUG="${GITHUB_REPOSITORY//\//-}"
+
+        {
+          echo "tag=$TAG"
+          echo "environment=$ENVIRONMENT"
+          echo "subdomain=$SUBDOMAIN"
+          echo "port=$PORT"
+          echo "resource-name=${REPO_SLUG}-${TAG}"
+        } >> "$GITHUB_OUTPUT"
+
     - name: Build Docker image
       shell: bash
       run: |
-        BUILD_ARGS="--build-arg APP_ENV=${{ inputs.environment }}"
+        BUILD_ARGS="--build-arg APP_ENV=${{ steps.derive.outputs.environment }}"
         for arg in ${{ inputs.build-args }}; do
           BUILD_ARGS="$BUILD_ARGS --build-arg $arg"
         done
         docker build \
           $BUILD_ARGS \
-          -t ${{ inputs.app-name }}:${{ inputs.tag }} \
+          -t ${{ inputs.app-name }}:${{ steps.derive.outputs.tag }} \
           -f dockerfile .
 
     - name: Deploy container
@@ -46,17 +71,16 @@ runs:
       run: |
         bash ${{ github.action_path }}/deploy.sh \
           --name "${{ inputs.app-name }}" \
-          --tag "${{ inputs.tag }}" \
-          --port "${{ inputs.port }}" \
+          --tag "${{ steps.derive.outputs.tag }}" \
+          --port "${{ steps.derive.outputs.port }}" \
           --internal-port "${{ inputs.internal-port }}" \
-          --env "${{ inputs.environment }}"
+          --env "${{ steps.derive.outputs.environment }}"
 
     - name: Register Pangolin resource
       shell: bash
       run: |
-        REPO_SLUG="${GITHUB_REPOSITORY//\//-}"
         bash ${{ github.action_path }}/pangolin-upsert.sh \
-          --subdomain "${{ inputs.subdomain }}" \
-          --port "${{ inputs.port }}" \
-          --resource-name "${REPO_SLUG}-${{ inputs.tag }}" \
+          --subdomain "${{ steps.derive.outputs.subdomain }}" \
+          --port "${{ steps.derive.outputs.port }}" \
+          --resource-name "${{ steps.derive.outputs.resource-name }}" \
           --target-ip "$PANGOLIN_TARGET_IP"