feat: add additional hillshade color ramp with opacity

[blacha]

Motivation

The current igor hillshades are one band uint8 these work great inside of GIS tools like QGIS where users can configure these hillshades to "mulitply" the underlying layers,

For web based tools like maplibre it does not have the same level of layering options and only really allows "overlay" where a one band greyscale image does not work.

The goal here is to convert the one band uint8 into a transparency based layer so it can be overlayed inside maplibre and qgis with a standard overlay function.

To do this the colors are mapped from 0 to RGBA 0,0,0,255 (black) and 255 to 0,0,0,0 (transparent)

0   -> 0 0 0 255
255 -> 0 0 0 0

Using QGIS with the base layer and "multiply" vs QGIS with the opacity output

Multiply	Overlay

Modifications

Adding an additional color ramp for one band hillshades to make a opacity based hillshade

Verification

[github-actions]

Configuration changes detected

Key: ➕ New | 🔄 Updated | 🗑️ Deleted

Tilesets

🔄 Updated

🔄 Hillshade Standard (ts_hillshade) 🌏 | 🗺️

• 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
• 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• ➕ .outputs.[1]:

{
  "title": "Color ramp (Opacity)",
  "name": "color-ramp-opacity",
  "pipeline": [
    {
      "type": "color-ramp",
      "ramp": "0 0 0 0 255\n255 0 0 0 0"
    }
  ],
  "background": {
    "r": 0,
    "g": 0,
    "b": 0,
    "alpha": 0
  }
}

• ➕ .outputs.0.default: true

• 🔄 New Zealand DEM Hillshade Overview (new-zealand_dem_hillshade_overview) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_01KB3J6F0WWXK118JN1FZ2EA9R" -> "im_01KGDTNMAD5Y2Z8ZTDBGQHPCF6"
• 🔄 .3857: "im_01KB3J6EM3GZXG25B81SPA9Y0G" -> "im_01KGDTNMA9W3559386XVHPQC5H"

• 🔄 New Zealand DEM Hillshade (new-zealand_dem_hillshade) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_4RhQEPRRTEVpQf6B21omXB9der4gRuaCvzTwCeWZSrSK" -> "im_01KGDTGXT7E0MSA1YF93KVCTKW"
• 🔄 .3857: "im_01KB3J4H9TGEQMT527T0K3FG7F" -> "im_01KGDTGXT7QTC2W91QVEV7SNJA"

🔄 Hillshade Igor DSM (ts_hillshade-igor-dsm) 🌏 | 🗺️

• 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
• 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• ➕ .outputs.[1]:

{
  "title": "Color ramp (Opacity)",
  "name": "color-ramp-opacity",
  "pipeline": [
    {
      "type": "color-ramp",
      "ramp": "0 0 0 0 255\n255 0 0 0 0"
    }
  ],
  "background": {
    "r": 0,
    "g": 0,
    "b": 0,
    "alpha": 0
  }
}

• ➕ .outputs.0.default: true

• 🔄 New Zealand DSM Hillshade Igor Overview (new-zealand_dsm_hillshade_igor_overview) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_01KB3J7Q92JGW5WBDQ0TP7897V" -> "im_01KGDTKX1VN1EZES5D3MWYZ5KT"
• 🔄 .3857: "im_01KB3J7R93HEN0FVS00CRY0BSS" -> "im_01KGDTKXCA47KP2VZ9C2RZMY4P"

• 🔄 New Zealand DSM Hillshade Igor (new-zealand_dsm_hillshade_igor) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_7Bb5kTZmuzkk2PxaYj5gzov14nsWnPY8HqptQVS1Ddat" -> "im_01KGDTJV2GCYW0FR6ZSG433873"
• 🔄 .3857: "im_01KB3J3ZRYKCZ9VAHDQ9T4S0ZC" -> "im_01KGDTJT9WD6Z71FRA845S5D4C"

🔄 Hillshade Standard DSM (ts_hillshade-dsm) 🌏 | 🗺️

• 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
• 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• ➕ .outputs.[1]:

{
  "title": "Color ramp (Opacity)",
  "name": "color-ramp-opacity",
  "pipeline": [
    {
      "type": "color-ramp",
      "ramp": "0 0 0 0 255\n255 0 0 0 0"
    }
  ],
  "background": {
    "r": 0,
    "g": 0,
    "b": 0,
    "alpha": 0
  }
}

• ➕ .outputs.0.default: true

• 🔄 New Zealand DSM Hillshade Overview (new-zealand_dsm_hillshade_overview) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_01KB3J6SYK2C5JYH0E2P5CPBWQ" -> "im_01KGDTNWQFFWG49N377QT05D51"
• 🔄 .3857: "im_01KB3J6SZTTJYEKJ8SM5E31P2Y" -> "im_01KGDTN7DVCDD57RSJ25499AEA"

• 🔄 New Zealand DSM Hillshade (new-zealand_dsm_hillshade) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_9hTeUTojo5AJp9caFLoTyosVzSCrnoajrsPs2xWU4W59" -> "im_01KGDTJB8EEVV0EC0PZFN00122"
• 🔄 .3857: "im_01KB3J47HJ11CKT12YH7SN3V4Y" -> "im_01KGDTJ9PQS19QZS1YQHB033V4"

🔄 Hillshade Igor (ts_hillshade-igor) 🌏 | 🗺️

• 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
• 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• ➕ .outputs.[1]:

{
  "title": "Color ramp (Opacity)",
  "name": "color-ramp-opacity",
  "pipeline": [
    {
      "type": "color-ramp",
      "ramp": "0 0 0 0 255\n255 0 0 0 0"
    }
  ],
  "background": {
    "r": 0,
    "g": 0,
    "b": 0,
    "alpha": 0
  }
}

• ➕ .outputs.0.default: true

• 🔄 New Zealand DEM Hillshade Igor Overview (new-zealand_dem_hillshade_igor_overview) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_01KB3JBB0YKN1X4H6ARJG4D3M7" -> "im_01KGDTKJNK70X39SZXQFFNBSJX"
• 🔄 .3857: "im_01KB3JB8GZGD04KJ6232EEFFNN" -> "im_01KGDTKJNFXQ4MRGN39XCK18X3"

• 🔄 New Zealand DEM Hillshade Igor (new-zealand_dem_hillshade_igor) 🌏 | 🗺️

  • 🎨⭐ Color ramp (color-ramp): 🌏 | 🗺️
  • 🎨 Color ramp (Opacity) (color-ramp-opacity): 🌏 | 🗺️

---

• 🔄 .2193: "im_E9EpEudboVNf2X19BDd17V1AdWpRvvsYRuXMzLcbXJUU" -> "im_01KGDTK9WH8SGA44M1MZ7NTQTK"
• 🔄 .3857: "im_01KB3J3E57VVB65FSE8VX737AS" -> "im_01KGDTK9WJX289ASM4ZSV9D10Q"