speed up image rebuilds and better UT for lerc

pcstac/Dockerfile

@@ -9,11 +9,15 @@ WORKDIR /opt/src
 
 COPY pcstac /opt/src/pcstac
 COPY pccommon /opt/src/pccommon
-RUN pip install -U "setuptools>=65.5.1"
+RUN --mount=type=cache,target=/root/.cache \
+    pip install -U "setuptools>=65.5.1"
 # The order of these pip installs is important :(
-RUN pip install -r ./pccommon/requirements.txt
-RUN pip install -r ./pcstac/requirements-server.txt
-RUN pip install --no-deps -e ./pccommon -e ./pcstac[server]
+RUN --mount=type=cache,target=/root/.cache \
+    pip install -r ./pccommon/requirements.txt
+RUN --mount=type=cache,target=/root/.cache \
+    pip install -r ./pcstac/requirements-server.txt
+RUN --mount=type=cache,target=/root/.cache \
+    pip install --no-deps -e ./pccommon -e ./pcstac[server]
 
 ENV APP_HOST=0.0.0.0
 ENV APP_PORT=81

pcstac/Dockerfile.dev

@@ -1,6 +1,9 @@
 FROM pc-apis-stac
 
-COPY requirements-dev.txt requirements-dev.txt
-RUN pip install -r requirements-dev.txt
 
-RUN pip install -e ./pccommon[dev] -e ./pcstac
+RUN --mount=type=cache,target=/root/.cache \
+    --mount=type=bind,source=requirements-dev.txt,target=requirements-dev.txt \
+    pip install -r requirements-dev.txt
+
+RUN --mount=type=cache,target=/root/.cache \
+    pip install -e ./pccommon[dev] -e ./pcstac

pctiler/Dockerfile

@@ -6,11 +6,15 @@ COPY pccommon /opt/src/pccommon
 COPY pctiler /opt/src/pctiler
 
 # Install the local modules in the new environment
-RUN /bin/sh -c "python -m pip install -U 'setuptools>=65.5.1'"
+RUN --mount=type=cache,target=/root/.cache \
+    /bin/sh -c "python -m pip install -U 'setuptools>=65.5.1'"
 # The order of these pip installs is important :(
-RUN /bin/sh -c "python -m pip install -r ./pccommon/requirements.txt"
-RUN /bin/sh -c "python -m pip install -r ./pctiler/requirements-server.txt"
-RUN /bin/sh -c "python -m pip install --no-deps -e ./pccommon -e ./pctiler[server]"
+RUN --mount=type=cache,target=/root/.cache \
+    /bin/sh -c "python -m pip install -r ./pccommon/requirements.txt"
+RUN --mount=type=cache,target=/root/.cache \
+    /bin/sh -c "python -m pip install -r ./pctiler/requirements-server.txt"
+RUN --mount=type=cache,target=/root/.cache \
+    /bin/sh -c "python -m pip install --no-deps -e ./pccommon -e ./pctiler[server]"
 
 # GDAL config
 ENV GDAL_CACHEMAX 200

pctiler/Dockerfile.dev

@@ -4,5 +4,9 @@ RUN curl -sL https://aka.ms/InstallAzureCLIDeb | bash
 
 COPY requirements-dev.txt requirements-dev.txt
 
-RUN python3 -m pip install -r requirements-dev.txt
-RUN python3 -m pip install -r pctiler/requirements-dev.txt
+RUN --mount=type=cache,target=/root/.cache \
+    --mount=type=bind,source=requirements-dev.txt,target=requirements-dev.txt \
+    python3 -m pip install -r requirements-dev.txt
+
+RUN --mount=type=cache,target=/root/.cache \
+    python3 -m pip install -r pctiler/requirements-dev.txt

pctiler/tests/test_asset_read.py

@@ -1,11 +1,20 @@
 import planetary_computer as pc
 import rasterio
-from titiler.core import utils as titiler_utils
+
 
 def test_rasterio_lerc_decompression() -> None:
     # Read a LERC file from Planetary Computer
-    url = "https://usgslidareuwest.blob.core.windows.net/usgs-3dep-cogs/usgs-cogs/USGS_LPC_VA_Fairfax_County_2018/hag/USGS_LPC_VA_Fairfax_County_2018-hag-2m-3-1.tif"
+    url = (
+        "https://usgslidareuwest.blob.core.windows.net/"
+        "usgs-3dep-cogs/usgs-cogs/"
+        "USGS_LPC_VA_Fairfax_County_2018/hag/"
+        "USGS_LPC_VA_Fairfax_County_2018-hag-2m-3-1.tif"
+    )
     signed_url = pc.sign(url)
+    # Although we call rasterio, this is really testing GDAL's LERC support.
+    # If the version of GDAL being shipped doesn't support LERC, then an exception like
+    # "rasterio.errors.RasterioIOError: Cannot open TIFF file due to missing codec.""
+    # Would be thrown.
     with rasterio.open(signed_url) as src:
-        compression = src.profile.get('compress')
-        assert compression == 'lerc_zstd'
+        compression = src.profile.get("compress")
+        assert compression == "lerc_zstd"